The WPL catalog lists 14 books, pamphlets and catalogs relating to the topical subject Flags. All are published in English.
Examples of some of our holdings:
Billings, A Compendium of Cacheted Covers with Flag Cancellations, 2nd ed.
Houston, The Hawaiian Flag
Langford, History of Flag Cancel Collecting 1940-1961
Langford, Standard Flag Cancel Encyclopedia
Ockum, Flag Cancellations Montevideo, Uruguay
Olsen, Flag Cancellations of Wisconsin Post Offices
In addition, the following journal is hardbound and available for reference:
Flag Cancellations [Complete Run from 1963-1986]
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