Carl Proper UNITE Publications #6000/057 PUBS. Kheel Center for Labor-Management Documentation and Archives, Cornell University Library.
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Carl Proper UNITE Publications #6000/057 PUBS. Kheel Center for Labor-Management Documentation and Archives, Cornell University Library. https://aspace3-test.library.cornell.edu/repositories/4/resources/11031 Accessed May 10, 2025.
