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Courtesy of UC Berkeley, Bancroft Library
http://www.oac.cdlib.org/ark:/28722/bk0000z0m9w/?order=1
Title:
During treatment: ambrotype plate removed from its case. Brass mat and preserver are in foreground, below open case, and there is no cover glass. Case cover and rail are detached. Project treatment form is at left. (Scanned from a 35mm slide.)
Contributing Institution:
UC Berkeley, Bancroft Library