A lower Eocene frigate bird from the Green River formation of Wyoming : (Pelecaniformes : fregalidae) - Olson, Storrs L.; U.S. Smithsonian Contributions to Pale Biology (Washington, D.C. : U.S. Smithsonian Contributions to Pale Biology, 1977)
Keywords: Frigate bird -- United States -- Wyoming; Paleontology -- Eocene; Paleontology -- Wyoming -- Lincoln County