Bathymetry shown by gradient tints and isolines.
At head of title: Commission for the Geologic Map of the World. Sub-Commission for the Metallogenic Map of the World.
Legend and text compiled with the collaboration of UNESCO.
Accompanies: Explanatory text, Metallogenic map of South America : 1:5,000,000 / English text by Cecily Petzall and Frances Delany.