Roberts, Ralph J. 1911-2007
Mineral deposits of Central America / by Ralph J. Roberts and Earl M. Irving. -- Washington : United States Government Printing Office, 1957 - 205 p. + map. -- (Geological Survey Bulletin ; 1034).
Centro América
Depósitos de minerales
553(72)
Mineral deposits of Central America / by Ralph J. Roberts and Earl M. Irving. -- Washington : United States Government Printing Office, 1957 - 205 p. + map. -- (Geological Survey Bulletin ; 1034).
Centro América
Depósitos de minerales
553(72)