The Foundations of National Prosperity
Studies in the Conservation of Permanent National Resources
by Richard Theodore Ely, Ralph Henry Hess, Thomas Nixon Carver ยท 1920
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Page count: 378
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.