U.S. Dept. of the Interior, U.S. Geological Survey : [Books and Open-File Reports, distributor],
Geology of the Venezuelan Guayana Shield and its relation to the entire Guayana Shield [microform]
Open-file report ;
U.S. Geological Survey open-file report ;
Sidder, Gary B.
Mendoza S., Vicente.
Geological Survey (U.S.)
Corporación Venezolana de Guayana.
by Gary B. Sidder and Vicente Mendoza S. ; prepared in cooperation with Corporacion Venezolana de Guayana-Compa~ia Tecnica Minera C.A.
Geology of the Venezuelan Guayana Shield and its relation to the entire Guayana Shield [microform]