"Honoring American Labor" First Day Cover issued on Labor Day 1956 #6216m. Kheel Center for Labor-Management Documentation and Archives, Cornell University Library.
Cite Item Description
"Honoring American Labor" First Day Cover issued on Labor Day 1956 #6216m. Kheel Center for Labor-Management Documentation and Archives, Cornell University Library. https://archives.library.cornell.edu/repositories/4/resources/11426 Accessed September 23, 2026.
