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Conservation And The Gospel Of Efficiency: The Progressive Conservation Movement, 18901920,New Akunin Discover the ultimate guide forThe Relevance And Importance Of Samuel P. Hay'S Book, Conservation And The Gospel Of Efficiency, Has Only Increased Over Time. Written Almost Half A Century Ago, It Offers An Invaluable History Of The Conservation Movement'S Origins, And Provides An Excellent Context For Understanding Contemporary Enviromental Problems And Possible Solutions. Against A Background Of Rivers, Forests, Ranges, And Public Lands, This Book Defines Two Conflicting Political