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![Identified! [Charles Greeley Abbot, astrophysicist and Secretary of the Smithsonian, with his device: a silver-disc pyrheliometer which measures direct beam solar irradiance] (LOC)](http://farm1.static.flickr.com/765/21899747561_754c9fc5f9_m.jpg)
Identified! [Charles Greeley Abbot, astrophysicist and Secretary of the Smithsonian, with his device: a silver-disc pyrheliometer which measures direct beam solar irradiance] (LOC)
by The Library of Congress
by The Library of Congress
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Two employees at the roundhouse at Proviso yard, C & NW RR., Chicago, Ill. (LOC)
by The Library of Congress
by The Library of Congress
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No known copyright restrictions(著作権制限なし)
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Women wipers of the Chicago and North Western Railroad cleaning one of the giant "H" class locomotives, Clinton, Iowa. Mrs. Marcella Hart and Mrs. Viola Sievers (LOC)
by The Library of Congress
by The Library of Congress
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