60 - Postage Dues, current edition (1999). 138 pgs. Much in-depth info. New. $30 $40
61 Australia: "Commercial Perfins of Australia" by Grant & Matthews, pub (1992), 289pgs plus index. All known types inc illustrations plus identification of users where possible. Slight foxing on page edges o/w VF & long out of print. Invaluable reference $80 $120