共 65 条
[51]
Annual Report of the Superintendent of the Yellowstone National Park,1880. U.S.Department of the Interior. . 1881
[52]
Preserving Nature in the National Parks:A History. Richard West Sellars. .
[53]
America’’s National Park System:The Critical Documents. .
[54]
Hearing before the Committee on the Public Lands,House of Representatives on H.R.434 and H.R.8668 Bills to Establish A National Park Service,and for other Purposes. . 1916
[55]
The Passage of the National Park Service Act of 1916. Donald C.Swain. The Wisconsin Magazine of History . 1966
[56]
Wilderness and American Mind. Roderick Frazier Nash. Yale University Press . 2001
[57]
Mr.Raker,from the Committee on the Public Lands,Submitted the Following Report to Accompany H.R.15522. House of Representatives 64thCongress,1stSession,Report No. 700 .
[58]
Hearing before the Committee on the Public Lands,House of Representatives on H R.434 and H.R.8668 Bills to Establish A National Park Service,and for other Purposes. . 1916
[59]
Guardians of the Parks:A History of the National Parks and Conservation Association. John C Miles. Talyor&Francis . 1995
[60]
Yosemite:The Embattled Wilderness. Alfred Runte. University of Nebraska Press . 1990