The Foundations of national prosperity
by Richard Theodore Ely, Ralph Henry Hess, C. K. Leith, Thomas Nixon Carver
Economic policyEconomic conditionsNatural resources
Conservation and economic theory, by R. T. Ely.--Conservation and economic evolution, by R. H. Hess.--Conservation of certain mineral resources, by C. K. Leith.--Conservation of human resources, by T. N. Carver.
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Book data: Open Library