Books about Natural resources -- Congresses
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Proceedings [of the] fourth National Conservation Congress [at] Indianapolis, October 1-4, 1912
United States. National Conservation Congress
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Proceedings of the second National Conservation Congress at Saint Paul, September 5-8, 1910
United States. National Conservation Congress
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Proceedings of the third National Conservation Congress at Kansas City, Missouri, September 25, 26 and 27, 1911
United States. National Conservation Congress
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Displaying results 1–3