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Materias primas en Venezuela
1964
Persistent link: https://www.econbiz.de/10002354731
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Recursos naturais da área-programa de Aripuanã
1976
Persistent link: https://www.econbiz.de/10002356519
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Recursos naturais do Brasil
Guerra, Antônio Teixeira - 1980 - 3. ed., rev. e autalizada
Persistent link: https://www.econbiz.de/10002358967
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Aspectos comunes a diversos recursos naturales : continuación
1963
Persistent link: https://www.econbiz.de/10002354358