Compiled under the direction of the Centre de documentation sur l'enseignement programmé of the Institut national pour la formation des adultes, Paris, and revised with the assistance of the International Centre for Advanced Technical and Vocational Training, Turin
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]