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Courtesy of UC Berkeley, Phoebe A. Hearst Museum of Anthropology
http://www.oac.cdlib.org/ark:/13030/tf3q2nb6s3/?order=1
Title:
Round Top. Azimuth from west across chasm. Instruments from left as follows:-Man holding bitimeter rod; Solar Radiador; Plane Table; Vertical ...
Contributing Institution:
UC Berkeley, Phoebe A. Hearst Museum of Anthropology