A new species of the fossorial mammal Arctoryctes from the Oligocene of Colorado / Reed, Charles A. text [Chicago] : Chicago Natural History Museum, 1956. eng p. 305-311 : 24 cm. Includes bibliographical references (p. 311). Fieldiana series has been published as Geological Series by Field Columbian Museum (1895-1909) and Field Museum of Natural History (1909-1943), and as Fieldiana: Geology by Chicago Natural History Museum (1945-1966) and Field Museum of Natural History (1966-). Arctoryctes. Paleontology -- Oligocene. Paleontology -- Colorado.