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George Gaylord Simpson sitting with unidentified man and woman.
George Gaylord Simpson, sitting in study at National Museum of Natural History.
George Gayrlord Simpson at Camp Number Two.
Crowd outside of Casa Rosada, after the revolution, Buenos Aires, Argentina.
George Gaylord Simpson and others at the sea-cow pond.
George Simpson, bust length portrait, while at University of Arizona.
George Gaylord Simpson, preparing to leave a fossile dig.
George Gaylord  Simpson and unidentified man, standing outside.
Jane Goodall to George G. Simpson, 1963 September 18