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000024435 1001_ $$aHays, Samuel P.
000024435 24510 $$aConservation and the gospel of efficiency;$$bthe progressive conservation movement, 1890-1920.
000024435 260__ $$aCambridge,$$bHarvard University Press,$$c1959.
000024435 300__ $$a297 p.$$c21 cm.
000024435 440_0 $$aHarvard historical monographs,$$v40
000024435 504__ $$a"Bibliographical note": p. [277]-282. Bibliographical footnotes.
000024435 650_0 $$aConservation of natural resources$$zUnited States$$xHistory.
000024435 650_0 $$aEnvironmental policy$$zUnited States$$xHistory.
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