www.postmarks.org
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Anchor text: Photos of post offices around the world
Anchor text: Post Mark Museum and Research Library
Anchor text: A Pen Cancel used by a postal employee to "kill" the stamps.
Anchor text: Covers from the Postmark Collectors Club Website
Anchor text: Summerville, GA Post Office mural
Anchor text: Margie Pfund Memorial Post Mark Museum and Research Library
Anchor text: Post Mark Museum and Research Library