Proceedings of the second Pan American scientific congress : the history and development of gold dredgind in Montana / by Jennungs, Hennen

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Proceedings of the second Pan American scientific congress : placer-mining methods and operating costs / by Janin, Charles

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Proceedings of the second Pan American scientific congress : legal and economic factors in the conservation of oil and gas / by Johnson, Roswell H.

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Proceedings of the second Pan American scientific congress : tanning materials from native source in Latin American countries / by Norton, Thomas H.

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Proceedings of the second Pan American scientific congress : dyestuffs from materials native to Latin-American countries / by Sadtler, Samuel P.

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Proceedings of the second Pan American scientific congress : electric furnace metallurgy / by Richards, J. W.

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Proceedings of the second Pan American scientific congress : coal fields of the United States considered as sources of supply for the western hemisphere / by Campbell, Marius R.

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Proceedings of the second Pan American scientific congress : the cement industry and its future development / by Eckel, Edwin C.

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Proceedings of the second Pan American scientific congress : cooper in America / by Weed, Walter Harvey

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Proceedings of the second Pan American scientific congress : buying and selling nonferrous metals of South America / by Vogelstein, Ludwig

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Proceedings of the second Pan American scientific congress : recent progress in electrical smoke precipitation / by Cottrell, F. G.

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Proceedings of the second Pan American scientific congress : organization and cost of geological surveys / by White, David

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Proceedings of the second Pan American scientific congress : explosives for use in industrial and commercial developments / by Munroe, Charles E.

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Proceedings of the second Pan American scientific congress : water and disease / by Mason, W. P.

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Proceedings of the second Pan American scientific congress : practical difficultives of conserving our fuel supply / by Burraws, J. S.

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Proceedings of the second Pan American scientific congress : the phosphate resources of the United States / by Mansfield, George Rogers

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Proceedings of the second Pan American scientific congress : conservation of iron ore / by Leith, C. K.

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Proceedings of the second Pan American scientific congress : the conservation of phosphate rock in the United States / by Phalen, W. C.

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Proceedings of the second Pan American scientific congress : ore dressing / by Richards, Robert Hallowell

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Proceedings of the second Pan American scientific congress : the genesis of the chilean nitrate deposits / by Singewald, Joseph T.

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