A classification of the biogeographical provinces of the world
1975
Udvardy, Miklos D. F. |
Classification
A preliminary classification of coastal and marine environments
1975
Ray, G. Carleton |
A system for defining and classifying natural regions for purposes of conservation : a progress report
1973
Dasmann, Raymond Fredric |
Classification and use of protected natural and cultural areas : a report
1973
Dasmann, Raymond Fredric |