Postage stamp collecting

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Maffei, Michael - Mike's Stamp Page
An online US postage stamp catalog of issues from the 19th and 20th century

Gelderen, Dirk van - Alaska Statehood Postmarks
A US postage stamp catalog with a very large listing of postmarks from the state of Alaska, USA

Denson, Ed - Ed Denson's Philatelic Home Page
A US postage stamp catalog with information and pricing guides about US postal plate number coils and Swedish stamps.

Findyourstampsvalue
Site of a online US postage stamp catalog

Digital Philately
An online US postage stamp catalog. Entries in the catalog are volunteer-submitted. People may also download a copy of the catalog.

FDC Publishing Company
A dealer of published US postage stamp catalogs of first day covers from the USA

Alaska Statehood Postmarks
An online US postage stamp catalog of Alaskan postmarks from 1959 to 1999