Inline Images: 
Frederick W. True, mammologist at the US National Museum, working with specimens, circa 1880s.
Walter Hough, anthropologist and ethnologist, holding coin in hand and looking at it through a magnifying glass.
Charles Whitney Gilmore, curator of the Division of Vertebrate Paleontology, with the vertebrae of a Diplodocus.
Dr. Johnston, with plant physiology equipment.
Doris Mable Cochran, a herpetologist in the Division of Reptiles and Amphibians, circa 1930s.
Mary Mann and Donald Davis with a scanning electron microscope in the National Museum of Natural History entomology collections, 1975.
Marine Biologist and National Museum of Natural History Curator David Pawson working with coral specimens, 1975.
Ichthyologist Robert Gibbs, National Museum of Natural History curator, examining a fish, 1975.
Walter Munn, working with the Smithsonian Astrophysical Observatory satellite tracking system, circa 1970.
Storrs Olson, ornithologist with the Smithsonian Environmental Research Center, studying a bird skull, 1969.
Elizabeth Gantt, a biologist at the Smithsonian's Radiation Biology Laboratory, studying algae, 1979.