Page "Stamped envelope" Paragraph 8

The Scott catalogue generally only describes United States envelope color and value of the indicia which is perfect for dealing with cut squares, but falls short of information needed to collect entires, i. e. the whole envelope.

The United Postal Stationery Society has two published books cataloging U. S. stamped envelopes.

These books describe all of the other stated criteria plus the envelope knife making them the most complete U. S. stamped envelope catalogs.