Collective Bargaining Postage Stamp First Day of Issue Cover #5479m. Kheel Center for Labor-Management Documentation and Archives, Cornell University Library.
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Collective Bargaining Postage Stamp First Day of Issue Cover #5479m. Kheel Center for Labor-Management Documentation and Archives, Cornell University Library. https://aspace3-test.library.cornell.edu/repositories/4/resources/10095 Accessed April 17, 2025.
