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Blau Marietta B1 Casual Portrait of Blau	Evans David B3 Evans Portrait	Oosterhoff Pieter B1 Pieter Oosterhoff at the Radcliffe Observatory	Oldenberg Otto B3 Otto Oldenberg at the Harvard Physics picnic	Oort Jan B4 Jan Oort at the Leiden Observatory
Paraskevopoulos John B1 John Paraskevopoulos at Harvard Kopje 14 miles from Bloemfontein, South Africa	Van den Bos Willem B1 Willem Van den Bos

Emilio Segrè Visual Archives