Hays, Samuel P. <br/><br/>
Conservation and the gospel of efficiency   the progressive conservation movement, 1890-1920 /   [electronic resource] : 
Samuel P. Hay s. 
 - Pittsburgh, Pa. :   University of Pittsburgh Press,   1999. 
 - xvi, 297 p. ;   20 cm. 
 - ACLS Humanities E-Book. .
<br/><br/>Includes bibliographical references (p. 277-282) and index. 
<br/><br/><br/> Electronic text and image data. <br/> Ann Arbor, Mich. : <br/> University of Michigan, Michigan Publishing, <br/> 2013. <br/> Includes both TIFF files and keyword searchable text. <br/> ([ACLS Humanities E-Book]) <br/> Mode of a ccess: Intranet. 
<br/><br/><label>Subjects--Topical Terms: </label><br/> Conservation of natural resources-- History.-- United States<br/> Environmental policy-- History.-- United States