Take a look at the residents of the Smithsonian's National Zoo in 1973 with these newly digitized images.

In 1935, Beloit College in Wisconsin began allowing female students to join the annual summer archeological expeditions.

Senior administrators stand next to their bicycles outside the Arts and Industries Building during an energy conservation campaign at SI, with David Challinor, Assistant Secretary for Science, Robert Angus Brooks, Under Secretary, and Wymberley Coerr, Director of International and Environmental Programs, June 3, 1974, by Richard Farrar. 

Pygmy hippopotamus in mud wallow at National Zoological Park, May 1973, by Francine Schroeder.

Emperor Hirohito of Japan examines marine specimens during his visit to the National Museum of Natural History, with Dr. Frederick M. Bayer, curator of echinoderms in the Department of Invertebrate Zoology, Dr. Joseph Rosewater, curator of mollusks in the Department of Invertebrate Zoology, and Professor Hidemi Sato, University of Pennsylvania, by Edward Ayensu, October 2, 1975.

See new collection highlights posted to the Smithsonian Institution Archives website.