Proceedings of the second Pan American scientific congress : geologia general y económica de Colombia / by Ospina, Tulio

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Proceedings of the second Pan American scientific congress : mineralogía, metalurgia y geología económica / by Fleury, Luis

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Proceedings of the second Pan American scientific congress : food and efficiency / by Wiley, Harvey W.

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Proceedings of the second Pan American scientific congress : methods and cost of obtaining crude petroleum in California / by Cox, Thomas

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Proceedings of the second Pan American scientific congress : contribución al análisis toxicológico del mercurio / by Renson, Carlos

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Proceedings of the second Pan American scientific congress : Bolivian tin and its relation to the United States / by Bancroft, Howland

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Proceedings of the second Pan American scientific congress : the occurrence and preparation of radium and associated metals / by Parsons, Charles L.

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Proceedings of the second Pan American scientific congress : improvement in mining and metallurgy an aid to conservation / by Ricketts, L. D.

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Proceedings of the second Pan American scientific congress : the storage and handling of explosives in mines / by Munroe, Charles E.

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Platinum-group elements: petrology, geochemistry, mineralogy by Mungall, James E.

Subjects: “…393 GEOLOGIA ECONOMICA…”

Proceedings of the second Pan American scientific congress : standard methods of sampling and analysis and standard samples / by Hillebrand, W.

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Proceedings of the second Pan American scientific congress : the coals of Brazil / by White, I. C.

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Proceedings of the second Pan American scientific congress : the mineral production of Latin America / by Roush, G. A.

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Proceedings of the second Pan American scientific congress : mining in Ecuador / by Mercer, J. W.

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Proceedings of the second Pan American scientific congress : drying oils produced in the Americas / by Gardner, Henry A.

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Proceedings of the second Pan American scientific congress : paint for Latin American countries / by Toch, Maximilian

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Proceedings of the second Pan American scientific congress : metallurgy of tin ores in Bolivia / by Hollister, Scoville E.

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Proceedings of the second Pan American scientific congress : chemical research as a directing aid in the efficient utilization of pine forests / by Herty, Charles H.

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Proceedings of the second Pan American scientific congress : the field for cyaniding in South America / by Megraw, Herbert A.

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Proceedings of the second Pan American scientific congress : concentración por flotación / by Fuchs, Federico G.

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