No. Registros Solicitud 1 5614 colombia



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No. Registros Solicitud

* 1 5614 colombia

Registro 1 de 5614 - GeoRef : 2002-2004/12

TI - TITLE: The geology of the Darien, Panama, and the late Miocene-Pliocene collision of the Panama Arc with northwestern South America.

AU - AUTHORS: Coates-Anthony-G; Collins-Laurel-S; Aubry-Marie-Pierre; Berggren-William-A

AF - AUTHOR AFFILIATION: Smithsonian Tropical Research Institute, PAN, Panama

SO - SOURCE: Geological Society of America Bulletin. 116; 11-12, Pages 1327-1344. 2004.

PB - PUBLISHER: Geological Society of America (GSA). Boulder, CO, United States. 2004.

CP - COUNTRY OF PUBLICATION: United-States

PY - PUBLICATION YEAR: 2004



LA - LANGUAGE: English

AB - ABSTRACT: The geology of the Darien province of eastern Panama is presented through a new geologic map and detailed biostratigraphic and paleobathymetric analysis of its Upper Cretaceous to upper Miocene sediments. The sequence of events inferred from the stratigraphic record includes the collision of the Panama arc (the southwestern margin of the Caribbean plate) and South American continent. Three tectonostratigraphic units underlie the Darien region: (1) Precollisional Upper Cretaceous-Eocene crystalline basement rocks of the San Blas Complex form a series of structurally complex topographic massifs along the northeastern and southwestern margins of the Darien province. These rocks formed part of a >20 m.y. submarine volcanic arc developed in a Pacific setting distant from the continental margin of northwestern South America. The northerly basement rocks are quartz diorites, granodiorites, and basaltic andesites, through dacites to rhyolites, indicating the presence of a magmatic arc. The southerly basement rocks are an accreted suite of diabase, pillow basalt, and radiolarian chert deposited at abyssal depths. Precollisional arc-related rocks, of Eocene to lower Miocene age, consist of 4000 m of pillow basalts and volcaniclastics, and biogenic calcareous and siliceous deep-water sediments. They consist of the Eocene-Oligocene Darien Formation, the Oligocene Porcona Formation and the lower-middle Miocene Clarita Formation. Postcollisional deposits are mostly coarse- to fine-grained siliciclastic sedimentary rocks and turbiditic sandstone of upper middle to latest Miocene age. This 3000 m thick sedimentary sequence is deformed as part of a complexly folded and faulted synclinorium that forms the central Chucunaque-Tuira Basin of the Darien. The sedimentary package reveals general shallowing of the basin from bathyal to inner neritic depths during the 12.8-7.1 Ma collision of the Panama arc with South America. The sediments are divided into the upper middle Miocene Tapaliza Formation, the lower upper Miocene Tuira and Membrillo Formations, the middle upper Miocene Yaviza Formation, and the middle to upper Miocene Chucunaque Formation. The precollisional open marine units of Late Cretaceous-middle Miocene age are separated from the overlying postcollisional sequence of middle to late Miocene age by a regional unconformity at 14.8-12.8 Ma. This unconformity marks the disappearance of radiolarians, the changeover of predominantly silica deposition from the Atlantic to the Pacific, the initiation of the uplift of the isthmus of Panama, and the onset of shallowing upward, coarser clastic deposition. This pattern is also recorded from the southern Limon Basin of Caribbean Costa Rica to the Atrato Basin of northwestern Colombia. By the middle late Miocene, neritic depths were widespread throughout the Darien region, and a regional unconformity suggests completion of the Central American arc collision with South America by 7.1 Ma. No Pliocene deposits are recorded from either the Darien or the Panama Canal Basin, and no sediments younger than 4.8 Ma have been identified in the Atrato Basin of Colombia, suggesting rapid uplift and extensive emergence of the Central American isthmus in the latest Miocene. Northward movement of the eastern segment of the Panama arc along a now quiescent Panama Canal Zone fault during Eocene-Oligocene time may have dislocated the pre-collision arc. Since collision, the portion west of this fault (Chorotega Block) has remained stable, without rotation; to the east, in the Darien region, compression has been accommodated through formation of a Panama microplate with convergent boundaries to the north (North Panama deformed belt) and south (South Panama deformed belt), and suturing with South America along the Atrato Valley. Deformation within the microplate has been accommodated in the Darien province by several major left-lateral strike-slip faults that were active until the early Pliocene, since when the plate has behaved rigidly.

DE - DESCRIPTORS: algae-; andesites-; basins-; benthonic-taxa; biostratigraphy-; Caribbean-Plate; Caribbean-region; Cenozoic-; Central-America; Chucunaque-Formation; coastal-environment; compression-; Darien-; depositional-environment; diorites-; faults-; Foraminifera-; granites-; granodiorites-; igneous-rocks; Invertebrata-; Isthmus-of-Panama; lithostratigraphy-; Membrillo-Formation; microfossils-; microplates-; Miocene-; nannofossils-; Neogene-; paleobathymetry-; paleogeography-; Panama-; planktonic-taxa; Plantae-; plate-collision; plate-convergence; plate-tectonics; Pliocene-; plutonic-rocks; Protista-; quartz-diorites; Radiolaria-; sedimentary-basins; sedimentary-rocks; South-American-Plate; strike-slip-faults; subtidal-environment; suture-zones; Tapaliza-Formation; tectonostratigraphic-units; Tertiary-; Tuira-Formation; unconformities-; upper-Miocene; volcanic-rocks; volcaniclastics-; Yaviza-Formation

CC - CATEGORY CODES: 12-Stratigraphy; 18-Solid-earth-geophysics

DT - DOCUMENT TYPE: Serial

BL - BIB LEVEL: Analytic

MC - MAP COORDINATES: LAT: N090700; N090700; LONG: W0794600; W0794600.

NN - ANNOTATION: With GSA Data Repository Item 2004169.

IL - ILLUSTRATION: Refs: 77; illus. incl. sects., 3 tables, geol. sketch map.

RF - REFERENCE SOURCE: GeoRef, Copyright 2004, American Geological Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States

IS - ISSN: 0016-7606

CO - CODEN: BUGMAF

UR - URL: (Series) http://www.gsajournals.org/gsaonline/?request=get-current-toc&issn=0016-7606

AN - ACCESSION NUMBER: 2004-085834

UD - UPDATE CODE: 200424

XURL - URLs, etc : URL

Registro 2 de 5614 - GeoRef : 2002-2004/12

TI - TITLE: The paleoecology of Late Cretaceous upwelling events from the upper Magdalena Basin, Colombia.

AU - AUTHORS: Martinez-J-Ignacio

AF - AUTHOR AFFILIATION: Universidad EAFIT, Departamento Geologia, Medellin, Colombia

BK - BOOK TITLE: In: La Luna special issue research reports.

BA - BOOK AUTHORS: Anonymous

SO - SOURCE: Palaios. 18; 4-5, Pages 305-320. 2003.

PB - PUBLISHER: Society of Economic Paleontologists and Mineralogists. Tulsa, OK, United States. 2003.

CP - COUNTRY OF PUBLICATION: United-States

PY - PUBLICATION YEAR: 2003

CN - CONFERENCE INFORMATION: La Luna Formation symposium. Caracas, Venezuela. Sept. 7-9, 2000.

LA - LANGUAGE: English

AB - ABSTRACT: Ten planktonic foraminiferal zones are identified and six stratigraphic sequences are interpreted in the Turonian-Maastrichtian interval of the Michu-1 well in the Upper Magdalena Basin. Anoxic bottom-water conditions prevailed during the Turonian and Coniacian followed by dysoxic conditions in the Santonian and Campanian. Oxic conditions were established during the Maastrichtian age. Upwelling occurred for most of the Late Cretaceous. Coccolithophorids, planktonic foraminifera, radiolaria, ammonites, clupeoid fish, and mosasaurs dominated the food-web structure of the Turonian-Coniacian interval. Following a major turnover during the Coniacian-Santonian boundary interval, dinoflagellates were the primary producers that sustained radiolarians, a sparse population of planktonic foraminifera, clupeoid fish, and ammonites. Dinoflagellate blooms (peridinoids) were frequent during the Campanian interval and sustained a sparse population of planktonic foraminifera and abundant clupeoid fish whose feces (Phosphatic pellets) were grazed extensively by a specialized population of buliminids dominated by the genus Siphogenerinoides.

DE - DESCRIPTORS: algae-; anaerobic-environment; assemblages-; biostratigraphy-; biozones-; Colombia-; Cretaceous-; depositional-environment; Dinoflagellata-; Foraminifera-; Invertebrata-; lithofacies-; lithostratigraphy-; Magdalena-Basin; marine-environment; Mesozoic-; microfossils-; nannofossils-; Olini-Group; paleoecology-; palynomorphs-; Plantae-; plate-tectonics; Protista-; Radiolaria-; sequence-stratigraphy; South-America; Upper-Cretaceous; upwelling-

CC - CATEGORY CODES: 12-Stratigraphy

DT - DOCUMENT TYPE: Serial; Conference-Document

BL - BIB LEVEL: Analytic

MC - MAP COORDINATES: LAT: N041500; N041500; LONG: W0751500; W0751500.

IL - ILLUSTRATION: Refs: 90; illus. incl. strat. col., 1 table, geol. sketch maps.

RF - REFERENCE SOURCE: GeoRef, Copyright 2004, American Geological Institute.

IS - ISSN: 0883-1351

AN - ACCESSION NUMBER: 2004-085713

UD - UPDATE CODE: 200424

Registro 3 de 5614 - GeoRef : 2002-2004/12

TI - TITLE: Paleogeography and stratigraphy of the La Luna Formation and related Cretaceous anoxic depositional systems.

AU - AUTHORS: Bralower-Timothy-J; Lorente-Maria-Antonieta

AF - AUTHOR AFFILIATION: Pennsylvania State University, Department of Geosciences, University Park, PA, United States

BK - BOOK TITLE: In: La Luna special issue research reports.

BA - BOOK AUTHORS: Anonymous

SO - SOURCE: Palaios. 18; 4-5, Pages 301-304. 2003.

PB - PUBLISHER: Society of Economic Paleontologists and Mineralogists. Tulsa, OK, United States. 2003.

CP - COUNTRY OF PUBLICATION: United-States

PY - PUBLICATION YEAR: 2003

CN - CONFERENCE INFORMATION: La Luna Formation symposium. Caracas, Venezuela. Sept. 7-9, 2000.

LA - LANGUAGE: English

DE - DESCRIPTORS: anaerobic-environment; Colombia-; Cretaceous-; depositional-environment; La-Luna-Formation; lithostratigraphy-; marine-environment; Mesozoic-; paleogeography-; South-America; Upper-Cretaceous; Venezuela-

CC - CATEGORY CODES: 12-Stratigraphy

DT - DOCUMENT TYPE: Serial; Conference-Document

BL - BIB LEVEL: Analytic

IL - ILLUSTRATION: Refs: 63

RF - REFERENCE SOURCE: GeoRef, Copyright 2004, American Geological Institute.

IS - ISSN: 0883-1351

AN - ACCESSION NUMBER: 2004-085712

UD - UPDATE CODE: 200424

Registro 4 de 5614 - GeoRef : 2002-2004/12

TI - TITLE: Tropical barrier islands of Colombia's Pacific coast.

AU - AUTHORS: Martinez-J-O; Gonzalez-J-L; Pilkey-O-H; Neal-W-J

AF - AUTHOR AFFILIATION: INGEOMINAS, Bogota, Colombia

SO - SOURCE: Journal of Coastal Research. 11; 2, Pages 432-453. 1995.

PB - PUBLISHER: Coastal Education and Research Foundation (CERF). Fort Lauderdale, FL, United States. 1995.

CP - COUNTRY OF PUBLICATION: United-States

PY - PUBLICATION YEAR: 1995

LA - LANGUAGE: English

LS - LANGUAGE OF SUMMARY: Spanish

AB - ABSTRACT: Sixty-two barrier islands on the Pacific Coast of Colombia are reported and described. The islands, covered by tropical rainforest and backed by mangrove forests, line the seaward margin of a narrow, extensive, deltaic plain formed from rivers draining the northwestern Andes. The islands are of interest because of a combination of factors including: their position on a leading-edge coast which contributes to relative sea-level rise through long-term subsidence; short-term seismic subsidence and tsunamis; their tropical setting where deltaic sedimentation and heavy vegetative cover influence island dynamics in terms of subsidence, river channel switching and quality and quantity of sand supply, the possible short-term influence of El Nino events; and the lack of human influence on island dynamics. Five genetic island groups are identified: two groups associated with straight stretches of coastal lowland and three delta lobe groups (Rio San Juan, Rio Patia, and Rio Mira deltas). A few of the islands formed due to spit detachment. Initially the islands were probably transgressive, then became regressive for an indeterminate period before recent reinitiation of a transgressive phase, and severe island front erosion. Many of the islands are sand starved due to sediment supply loss when distributary switching occurred, or because they are in areas with little sand in the associated mangrove substrate and no fluvial sand supply. The recognition of the barrier island nature of this coast provides a new management tool to guide coastal hazard mitigation and future development. Future stratigraphic studies may provide a basis to identify the frequency of short-term events such as El Nino and tsunamis and to establish recent sea level history for specific island groups.

DE - DESCRIPTORS: barrier-islands; coastal-environment; coastal-sedimentation; Colombia-; dimensions-; erosion-; geomorphology-; landform-evolution; littoral-erosion; mapping-; Pacific-Ocean; sedimentation-; shore-features; South-America; tropical-environment; tsunamis-; vegetation-

CC - CATEGORY CODES: 23-Geomorphology

DT - DOCUMENT TYPE: Serial

BL - BIB LEVEL: Analytic

MC - MAP COORDINATES: LAT: N010000; N070000; LONG: W0773000; W0790000.

IL - ILLUSTRATION: Refs: 23; illus. incl. 2 tables, sketch map.

RF - REFERENCE SOURCE: GeoRef, Copyright 2004, American Geological Institute.

IS - ISSN: 0749-0208

AN - ACCESSION NUMBER: 2004-085191

UD - UPDATE CODE: 200424

Registro 5 de 5614 - GeoRef : 2002-2004/12

TI - TITLE: Comportamiento geoquimico de las manifestaciones geotermicas en el flanco oriental del volcan el Nevado del Ruiz (Rio Claro-Las Nereidas), Colombia

Translated Title: Geochemical behavior of the thermal springs on the eastern flank of Nevado del Ruiz volcano (Rio Claro-Las Nereidas), Colombia.

AU - AUTHORS: Gonzalez-Partida-Eduardo; Arellano-Gomez-Victor-Manuel; Barragan-Reyes-Rosa-Maria; Birkle-Peter; Torres-Rodriguez-Vicente

AF - AUTHOR AFFILIATION: Instituto de Investigaciones Electricas, MEX, Mexico

SO - SOURCE: Ingenieria Hidraulica en Mexico (1985). 12; 3, Pages 5-13. 1997.

PB - PUBLISHER: Instituto Mexicano de Tecnologia del Agua. Mexico, D.F., Mexico. 1997.

CP - COUNTRY OF PUBLICATION: Mexico

PY - PUBLICATION YEAR: 1997

LA - LANGUAGE: Spanish

LS - LANGUAGE OF SUMMARY: English

DE - DESCRIPTORS: bicarbonate-ion; boron-; Central-Cordillera; chloride-ion; chlorine-; Colombia-; enthalpy-; geochemistry-; ground-water; halogens-; heat-sources; high-temperature; hot-springs; hydrochemistry-; magma-chambers; magmas-; Nevado-del-Ruiz; potassium-ion; sodium-ion; South-America; springs-; temperature-; thermal-waters; volcanoes-

CC - CATEGORY CODES: 02B-Hydrochemistry

DT - DOCUMENT TYPE: Serial

BL - BIB LEVEL: Analytic

MC - MAP COORDINATES: LAT: N045300; N045300; LONG: W0752200; W0752200.

IL - ILLUSTRATION: Refs: 9; illus. incl. sect., 2 tables, sketch maps.

RF - REFERENCE SOURCE: GeoRef, Copyright 2004, American Geological Institute.

IS - ISSN: 0186-4076

AN - ACCESSION NUMBER: 2004-084237

UD - UPDATE CODE: 200424

Registro 6 de 5614 - GeoRef : 2002-2004/12

TI - TITLE: Litterflow chemistry and nutrient uptake from the forest floor in northwest Amazonian forest ecosystems.

AU - AUTHORS: Tobon-Conrado; Sevink-Jan; Verstraten-Jacobus-M

AF - AUTHOR AFFILIATION: Vrije Universiteit Amsterdam, Department of Hydrology and Geo-Environmental Sciences, Amsterdam, Netherlands

SO - SOURCE: Biogeochemistry (Dordrecht). 69; 3, Pages 315-339. 2004.

PB - PUBLISHER: Nijhoff/Junk. Dordrecht-Boston-Lancaster, Netherlands. 2004.

CP - COUNTRY OF PUBLICATION: Netherlands

PY - PUBLICATION YEAR: 2004

LA - LANGUAGE: English

AB - ABSTRACT: Samples of the fraction of net rainfall passing through the forest floor collected at monthly intervals in four pristine forests in Colombian Amazonia, during the period between 1995-1997 were analysed for solute concentrations to estimate the element fluxes from the forest floor into the mineral soil and root nutrient uptake from these forest floors. Results were compared with inputs by throughfall, stemflow, litterfall and fine root decay. Element concentrations were tested for their relationship with litterflow amounts, rainfall intensity and length of the antecedent dry period and differences in element fluxes between ecosystems were assessed. Concentrations of elements in litterflow followed a similar pattern as those in throughfall, which indicates that element outputs from the forest floor are strongly related to those inputs in throughfall. In the forests studied, the average concentrations of elements as K, Mg, orthoP and the pH of the litterflow decreased relative to that in throughfall in most events, while the concentration of elements such as dissolved organic carbon, H, SO (sub 4) and Si increased in litterflow from these forests. Element concentrations in litterflow showed a poor correlation with variables such as litterflow amounts, rainfall intensity and antecedent dry period, except for K which showed a significant correlation (p>0.95) with analysed variables in all forests. Outputs were significantly different between forests (p>0.95); these fluxes, which particularly concerned cations, being the largest in the flood plain, while for anions outputs increased from the flood plain to the sedimentary plain. After adding the nutrient contributed by litter decomposition and fine root decay, the net outputs of main elements from the forest floors were still smaller than inputs by net precipitation (throughfall + stemflow) indicating that the litter layers clearly acted as a sink for most nutrients. Accordingly, the element balances confirm that the forest floors acted as a sink for nutrients coming in by throughfall, stemflow, litterfall and fine root decomposition. P, Mg and N appeared to be the most limiting nutrients and the forests studied efficiently recycled these nutrients.

DE - DESCRIPTORS: Amazonas-Colombia; anions-; atmospheric-precipitation; carbon-; cations-; Colombia-; concentration-; correlation-; ecosystems-; fines-; forests-; geochemistry-; hydrochemistry-; nutrients-; organic-carbon; pH-; rain-; soils-; solutes-; South-America

CC - CATEGORY CODES: 22-Environmental-geology; 02B-Hydrochemistry

DT - DOCUMENT TYPE: Serial

BL - BIB LEVEL: Analytic

IL - ILLUSTRATION: 5 tables.

RF - REFERENCE SOURCE: GeoRef, Copyright 2004, American Geological Institute. Reference includes data from PASCAL, Institute de l'Information Scientifique et Technique, Vandoeuvre-les-Nancy, France

IS - ISSN: 0168-2563

AN - ACCESSION NUMBER: 2004-083951

UD - UPDATE CODE: 200424

Registro 7 de 5614 - GeoRef : 2002-2004/12

TI - TITLE: La cueva del Indio en Bochalema, departamento norte de Santander, Columbia

Translated Title: The Indio's Cave of Bohalema, northern Santander, Colombia.

AU - AUTHORS: Carreno-Rafael; Ghneim-Khalil

AF - AUTHOR AFFILIATION: Sociedad Venezolana de Espeleologia, Departamento de Catastro, Caracas, Venezuela

SO - SOURCE: Boletin de la Sociedad Venezolana de Espeleologia. 35; Pages 62-64. 2001.

PB - PUBLISHER: Sociedad Venezolana de Espeleologia. Caracas, Venezuela. 2001.

CP - COUNTRY OF PUBLICATION: Venezuela

PY - PUBLICATION YEAR: 2001

LA - LANGUAGE: Spanish

LS - LANGUAGE OF SUMMARY: English

AB - ABSTRACT: A speleological survey was done in the southwest of the Maracaibo lake basin, near the Bochalema town. The Indio's Cave was briefly studied, the topography results in 124 m of development and 58 m depth. A bat's colony generates a guano deposit, where some preliminary biological observations are referred with the classes of Insecta, Arachnida and Crustacea. The cavity also have an anthropological relevance, due to the folkloric data reported.

DE - DESCRIPTORS: Bohalema-Colombia; caves-; Colombia-; geomorphology-; Indio'-s-Cave; karst-; Santander-Colombia; solution-features; South-America; topography-

CC - CATEGORY CODES: 23-Geomorphology

DT - DOCUMENT TYPE: Serial

BL - BIB LEVEL: Analytic

MC - MAP COORDINATES: LAT: N054500; N080800; LONG: W0722000; W0743000.

IL - ILLUSTRATION: Refs: 3; sketch map.

RF - REFERENCE SOURCE: GeoRef, Copyright 2004, American Geological Institute.

IS - ISSN: 0583-7731

CO - CODEN: SVEBAU

AN - ACCESSION NUMBER: 2004-083689

UD - UPDATE CODE: 200424

Registro 8 de 5614 - GeoRef : 2002-2004/12

TI - TITLE: Effects in the determination of oil reserves due to gravitational compositional gradients in near-critical reservoirs.

AU - AUTHORS: Barrufet-M-A; Jaramillo-J-M

AF - AUTHOR AFFILIATION: Texas A&M University, Department of Petroleum and Chemical Engineering, USA, United States

SO - SOURCE: Journal of Canadian Petroleum Technology. 43; 7, Pages 31-37. 2004.

PB - PUBLISHER: Canadian Institute of Mining and Metallurgy. Montreal, PQ, Canada. 2004.

CP - COUNTRY OF PUBLICATION: Canada

PY - PUBLICATION YEAR: 2004

LA - LANGUAGE: English

AB - ABSTRACT: Several factors, including gravity, temperature, reservoir and fluid properties, geological structure, and the accumulation process may have important effects on the spatial compositional variation of hydrocarbon fluids in reservoirs. Compositional gradient may be considerable in near-critical reservoirs and can have a profound impact on the estimation of initial in situ hydrocarbons, the prediction of oil/gas contact location (OGC), and, more importantly, on the reservoir development strategies. Some reservoirs have producing intervals with thicknesses that cover hundreds of feet from top to bottom, and sometimes even more than 7,000 ft. Over such a thickness, because of gravity segregation, the mole fraction of the lighter components decreases with depth, while the mole fraction of the heavier components increase from the top to the bottom of the reservoir. Modelling the thermodynamic behaviour of these fluids requires a properly turned EOS capable of reproducing the available PVT data and the gravitational compositional gradation. We studied near-critical fluids (gas condensates and volatile oils) from the Cusiana Field in Colombia. PVT reports consisting of constant composition expansion (CCE) and constant volume depletion (CVD) tests were used to calibrate the fluid model and the EOS parameters. We used the Peng Robinson EOS with volume translation and the Whitson's methodology for defining and characterizing the pseudo-components. We evaluated the effect of an isothermal gravitational compositional gradient upon the determination of in-place hydrocarbon content, spatial fluid properties, and reservoir development planning scenarios.

DE - DESCRIPTORS: Cenozoic-; Colombia-; condensates-; Cusiana-Field; Eocene-; gravity-anomalies; isotherms-; mathematical-models; Mirador-Formation; oil-and-gas-fields; oil-wells; oil-gas-interface; Paleogene-; petroleum-engineering; reservoir-properties; South-America; Tertiary-; Well-Buenos-Aires

CC - CATEGORY CODES: 29A-Economic-geology,-geology-of-energy-sources

DT - DOCUMENT TYPE: Serial

BL - BIB LEVEL: Analytic

IL - ILLUSTRATION: Refs: 17; illus. incl. 4 tables.

RF - REFERENCE SOURCE: GeoRef, Copyright 2004, American Geological Institute.

IS - ISSN: 0021-9487

CO - CODEN: JCPMAM

AN - ACCESSION NUMBER: 2004-083661


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