TY  - BOOK
AU  - Hays,Samuel P.
TI  - Conservation and the gospel of efficiency: the progressive conservation movement, 1890-1920
SN  - 0674165012
AV  - HC103.7 .H3
U1  - 333.720973 
PY  - 1959///
CY  - Cambridge
PB  - Harvard University Press
KW  - Conservation of natural resources
KW  - United States
KW  - History
KW  - Environmental policy
KW  - Milieubeleid
KW  - gtt
KW  - Conservation des ressources naturelles
KW  - États-Unis
KW  - Histoire
KW  - Environnement
KW  - Politique gouvernementale
N1  - "Bibliographical note": p. [277]-282. Bibliographical footnotes
UR  - http://www.archive.org/details/conservationgosp00hays
UR  - http://www.openlibrary.org/books/OL6271974M
ER  -