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Courtesy of UC Berkeley, Bancroft Library
http://www.oac.cdlib.org/ark:/13030/tf6m3nb5zg/?order=1
Title:
Near California and Powell Sts. Butler Building in the upper right, opposite Union Square; the beam hanging from the crane swung 18 feet, as measured by John Birmingham, the superintindent of the Hercules Powder Co.
Contributing Institution:
UC Berkeley, Bancroft Library