TY  - GEN
AU  - Billington, Allen Ray
TI  - Westward expansion: a history of the American frontier
PY  - 1949///
CY  - New York
PB  - The Macmillan Company
KW  - United States
KW  - Territorial expansion
KW  - History
KW  - Mississippi River Valley
KW  - 1803-1865
KW  -  West (U.S.)
ER  -