Conservation and the gospel of efficiency ; the progressive conservation movement, 1890-1920.
| Author/creator | Hays, Samuel P. |
| Format | Book |
| Publication Info | Cambridge : Harvard University Press, 1959. |
| Description | 297 pages ; 21 cm. |
| Subjects |
| Series | Harvard historical monographs ; 40 Harvard historical monographs 40. ^A27992 |
| Bibliography note | "Bibliographical note": p. [277]-282. Bibliographical footnotes. |
| LCCN | 59009274 |