"Honoring American Labor" First Day Cover issued on Labor Day 1956 #6216m. Kheel Center for Labor-Management Documentation and Archives, Cornell University Library.
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"Honoring American Labor" First Day Cover issued on Labor Day 1956 #6216m. Kheel Center for Labor-Management Documentation and Archives, Cornell University Library. https://aspace3-test.library.cornell.edu/repositories/4/resources/11426 Accessed July 13, 2026.
