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2
Geological Survey (U.S.),
2
United States. Technical Cooperation Administration,
1
Consejo de Recursos Naturales No Renovables (Mexico),
1
Instituto Nacional para la Investigación de Recursos Minerales (Mexico)
1
Mapes Vázquez, Eduardo,
1
Segerstrom, Kenneth, 1909-1992,
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Simons, Frank S. 1917-
1
United States. Foreign Operations Administration,
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