Gillman, C.
Physiography of central and southern africa. - New York-US : Geografical record, 1940. - páginas 343-344 : Ilustraciones blanco y negro - Irregular - Vol. XXX, no. 2(Apr. 1940) - The Geographical Review ; no. 2 . - The Geographical Review. .
Physiography of central and southern africa. - New York-US : Geografical record, 1940. - páginas 343-344 : Ilustraciones blanco y negro - Irregular - Vol. XXX, no. 2(Apr. 1940) - The Geographical Review ; no. 2 . - The Geographical Review. .