TY  - BOOK
ED  - Conservation Foundation.
TI  - National parks for the future: an appraisal of the national parks as they begin their second century in a changing America 
PY  - 1972///
CY  - Washington, D. C.
PB  - The Conservation Foundation
KW  - National parks and reserves
KW  - United States
N1  - p. 254
ER  -