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La investigación y los recursos mineros en España
Guereca Tosantos, Luis, (1970)
Mexican silver and the englightenment
Motten, Clement G., (1972)
Post-graduate training and research in applied science in developing countries, the case of mineral exploration
Hale, W. E., (1977)
Making a desert give up its treasures
Heath, K. C. G., (1967)