The Underground Railroad Post Office in Postumia Grotte 1872-1945
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The American Philatelic Congress
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Lera, Thomas M. 2011. "<a href="https://repository.si.edu/handle/10088/18595">The Underground Railroad Post Office in Postumia Grotte 1872-1945</a>." In <em>The Congress Book 2011</em>. Trettin, Kenneth, editor. 65–77. The American Philatelic Congress.