John Ertl. Wisconsin and Ohio Labor Rallies, April 2011. Photographs (digital), #6320 P(d). Kheel Center for Labor-Management Documentation and Archives, Cornell University Library.
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John Ertl. Wisconsin and Ohio Labor Rallies, April 2011. Photographs (digital), #6320 P(d). Kheel Center for Labor-Management Documentation and Archives, Cornell University Library. https://archives.library.cornell.edu/repositories/4/resources/11583 Accessed December 25, 2025.
