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Courtesy of UC Berkeley, Bancroft Library
http://www.oac.cdlib.org/ark:/13030/tf9s20127j/?order=1
Title:
Capt. Dan O'Brien and a squad of S.F. [San Francisco] Police Officers receiving instructions in the handling of a machine gun by the U.S. Marin's [Marines] in front of the Hall of Justice. Sept. 18th, 1920.
Contributing Institution:
UC Berkeley, Bancroft Library