TY  - BOOK
AU  - Billington,Ray Allen
AU  - Ridge,Martin
TI  - Westward expansion: a history of the American frontier 
SN  - 0023098600
PY  - 1982///
CY  - New York, N.Y.
PB  - MacMillan
KW  - United States
KW  - Territorial expansion
KW  - History
KW  - Mississippi Valley
KW  - 1803-1865
KW  - West (U.S.)
N1  - Includes bibliography and index
ER  -