Commission for the Geological Map of the World, Ministery of Mines and Energy, National Department of Mineral Production (Brazil), with the collaboration of Unesco ; co-ordinator general, Fernando Flávio Marques de Almeida ; [translation from the Spanish text by Frances Delany]
prepared by the Exploration Dept. of Shell Oil Co. ; edited by T. D. Cook and A. W. Bally ; compiled by S. Milner...[and others] ; cartography and drafting by W. C. Heuer...[and others]