TY  - BOOK
AU  - Tilden,Freeman
TI  - The national parks
AV  - E160 .T5 1968
U1  - 917.3 
PY  - 1951///
CY  - New York
PB  - Knopf
KW  - National parks and reserves
KW  - United States
KW  - Local
ER  -