Sanborn, Ethel Ida, 1883- Eocene flora of Western America (by) Ethel I. Sanborn, Susan S. Potbury (and) Harry D. MacGinitie. Washington, Carnegie Institution of Washington, 1937 156 p. láms. 30 cm. ( Carnegie Institution of Washington. Publication no.465) A la cabeza del título: " Contributions to palaeontology".