Proceedings of second Pan American scientific congress : the conservation of human energy / by Carver, T. N.

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Proceedings of second Pan American scientific congress : conservation of the oil and gas resources of the Americans / by Arnold, Ralph

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Proceedings of second Pan American scientific congress : conservation in its relation to industrial evolution / by Hess, Ralph Henry

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Proceedings of second Pan American scientific congress : the conservation of copper / by Emmons, W. H.

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Proceedings of second Pan American scientific congress : conservation of metals by the recovery and use of scrap metals and drosses / by Dunlop, John P.

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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 : conservation of iron ore / by Leith, C. K.

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Some Principles of Conservation Biology, as the Apply to Environmental Law / by Noss, Reed F

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Proceedings of second Pan American scientific congress : scientific forestry for Latin America / by Moore, Barrington

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Proceedings of second Pan American scientific congress : conservation and economic theory / by Ely, Richard T.

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Proceedings of the second Pan American scientific congress : the potential influence of vital statistics on the conservation of human life / by Rankin, W. S.

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Playing Noah / by Capeland Nagle, John

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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.

Subjects: “…MINERIA-METALURGIA-CONSERVACION…”

Proceedings of second Pan American scientific congress : the people's interest in water-power resources / by Smith, George Otis

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Proceedings of second Pan American scientific congress : irrigation in the United States / by Fortier, Samuel

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Proceedings of second Pan American scientific congress : engineering work of the United States reclamation service / by Davis, Arthur Powell

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Proceedings of second Pan American scientific congress : the function of live stock in agriculture / by Rommel, George M.

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Proceedings of second Pan American scientific congress : great central markets for live stock and meats / by Hall, Louis D.

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Proceedings of second Pan American scientific congress : the advisability of collegiate courses on marketing and distribution / by Carver, T. N.

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Proceedings of second Pan American scientific congress : opportunities afforded the railroads of the United States for profitable agricultural development work / by Powell, T. F.

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