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Kamen Martin C1

Martin Kamen (left) and Harold Urey (right) conversing

Adams Walter C6

Adams, Jeans and Hubble at Mount Wilson Observatory

Waterman Alan C1

Alan Watermand and Aden Meinel at Kitt Peak National Observatory

Waterman Alan C2

Alan Watermand and Aden Meinel at Kitt Peak National Observatory

Harvard College Observatory D3

Unidentified young men standing on the grounds of the Harvard College Observatory