Description
Item Description:"Prepared in cooperation with the Universidad Nacional de Mexico, Instituto de Geologia and Secretaria de la Economia Nacional Direccion General de Minas Y Petoleo under the auspices of the Interdepartmental committee on Cultural and Scientific Cooperation, Department of State."
Title from title screen (viewed July 10, 2014).
Physical Description:1 online resource (iv, 49-71 pages, 7-24 pages of plates) : illustrations, maps (some color).
Bibliography:Includes bibliographical references.