The geological history and evolution of the horse / by Elmer S. Riggs, Assoc. Curator of Paleontology.
History and evolution of the horse
Riggs, Elmer S.,
Field Museum of Natural History. Dept. of Geology
Field Museum of Natural History,
Fieldiana, Popular series, Geology, was published by Field Museum of Natural History, Dept. of Geology as Leaflet (no. 1-4, 1922-1923) and as Geology leaflet (no. 5-14, 1925-1933). The Leaflet series
QE1 .F5 no.13
Geology leaflet (Field Museum of Natural History) ; no. 13