TY  - BOOK
AU  - NATIONAL GEOGRAPHIC SOCIETY
TI  - Wilderness U. S. A / 
U1  - 917.3'04 
PY  - 1975///
CY  - [S.N] : 
PB  - NATIONAL GEOGRAPHIC SOCIETY ، 
KW  - UNITED STATES - WILDERNESS AREAS
KW  - CAMPING UNITED STATES
ER  -