 | Botany Africa. | (2) |
 |
 | Observations on stengelioid species of Vernonia / by C. Earle Smith, Jr. Smith, C. Earle (Claude Earle), 1922- 4n Washington, D.C. : Agricultural Research Service, U.S. Dept. of Agriculture, 1971. | |
| Photographic documentation of vegetational changes in Africa over a third of a century / H.L. Shantz and B.L. Turner. Shantz, H. L. (Homer LeRoy), 1876-1958. cn Tucson, Ariz. : Agricultural Experiment Station, University of Arizona, 1958. | |
|