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https://explore.chicagocollections.org/records/?f1-topics=Natural%20%26%20Built%20Environments::Railways&f2-topics=Government%20%26%20Leadership::Civil%20Rights&f3-topics=Work::Labor%20Relations&f4-topics=Natural%20%26%20Built%20Environments::Railways&f5-institutions=Chicago%20History%20Museum&f6-types=Archival%20Collections