TY  - BOOK
ED  - National Geographic Society (U.S.).
TI  - Exploring America's valleys: from the Shenandoah to the Rio Grande 
SN  - 087044476X :
AV  - GB 564 .E9
U1  - 917.30944 19
PY  - 1984///]
CY  - Washington, D.C.
PB  - National Geographic Society
KW  - Valleys
KW  - United States
N1  - Includes index; Bibliography: p. 199
ER  -