| Choo Yuen May, (6) |
| Clandinin, Michael T. (6) |
| Conference on classification and management of tropical soils (6) |
| Contraloría General de la República (Colombia) (6) |
| Corrado, F., (6) |
| Daviron, B., (6) |
| Dubos, B. (6) |
| Duval, Yves (6) |
| Elias, B.A. (6) |
| Enig, Eric N., (6) |
