The foundations of national prosperity, studies in the conservation of permanent national resources

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Pt. 1. Conservation and economic theory, by Richard T. Ely.- Pt. 2. Conservation and economic evolution, by Ralph H. Hess.- Pt. 3. Conservation of certain mineral resources, by Charles K. Leith.- Pt. 4. Conservation of human resources, by Thomas Nixon Carver 26
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0984871004

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