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Start Over You searched for: Media Type Manuscripts Remove constraint Media Type: Manuscripts Subject Building trades'Employees--Labor unions Remove constraint Subject: Building trades'Employees--Labor unions Collection Records of the Bricklayers, Masons and Plasterers International Union of America, 1950-1955 Remove constraint Collection: Records of the Bricklayers, Masons and Plasterers International Union of America, 1950-1955 Date 1950 Remove constraint Date: 1950