Plate glass negatives.
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Brashear, John A. (John Alfred), 1840-1920
http://n2t.net/ark:/99166/w6pg2319 (person)
Dr. Brashear was born in Brownsville, Pa. He studied science and became director of the Allegheny Observatory. He also served as Chancellor for the Western University of Pennsylvania. He was a member of several scientific and astronomical societies. From the description of John Alfred Brashear papers 1872-1915. (Historical Society of W Pennsylvania). WorldCat record id: 39397488 ...