TY  - BOOK
AU  - Hays,Samuel P
TI  - Conservation and the gospel of efficiency: the progressive conservation movement, 1890-1920 
PY  - 1959///
CY  - Cambridge, Mass.
PB  - Harvard University Press
KW  - Conservation of natural resources
KW  - United States
KW  - History
KW  - Environmental policy
N1  - 'Bibliographical note': p. 277-282. Bibliographical footnotes
ER  -