De La Fuente Duch, Maurico Fernando Francisco Evaluation of integrated exploration program for revitalization of old mining districts (Microform) by Mauricio Fernando Francisco de la Fuente Duch - Ann Arbor, Mich. University Microfilms International 1980 - 2 microfiches ; 11 x 15 cm. Thesis (Ph.D.)-University of Arizona, 1979 ISBN: Y910040038 Subjects--Topical Terms: Mining engineering