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＜図書＞
The Foundations of national prosperity : studies in the conservation of permanent national resources / by Richard T. Ely {and others} New York, Macmillan, 1918.
(Series in American studies)

出版者	New York : Johnson Reprint
出版年	1971
大きさ	xxix, 378 p ; 23 cm.
著者標目	Ely, Richard Theodore, 1854-1943
件　名	Natural resources -- United States  全ての件名で検索 United States -- Economic conditions  全ての件名で検索 United States -- Economic policy  全ての件名で検索
内容注記	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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