This catalogue of United States postage stamps, stamped envelopes, specimen stamps, and proofs is published with the view of acquainting philatelists with what the Museum desires the Government collection of United States stamps to represent when completed.

Contains current market prices for the United States, U.S. Possessions and trust territories Canada and provinces, and all United Nations. Includes U.S. commemorative index and colorful stamp identifier, grading criteria, and more for the United States and British North America. Full Color

February issue includes Appendix entitled Directory of United States Government periodicals and subscription publications; September issue includes List of depository libraries; June and December issues include semiannual index