prepared in cooperation with the Departamento Nacional de Aguas e Energia Eletrica, Departamento Nacional de Produca̧õ Mineral, and the Companhia de Pesquisa de Recursos Minerais of Brazil
by J.S. Pallister ... [and others] ; prepared by the U.S. Geological Survey in cooperation with the Deputy Ministry for Mineral Resources, Saudi Arabia
by William R. Greenwood ... [and others] ; prepared for Ministry of Petroleum and Mineral Resources, Deputy Ministry for Mineral Resources ; United States Department of the Interior, Geological Survey