TY  - BOOK
AU  - Billington,Ray Allen
TI  - The American frontier thesis: attack and defense 
PY  - 1971///
CY  - Washington
PB  - American Historical Association
KW  - Turner, Frederick Jackson,
KW  - Frontier thesis
N1  - 1958 and 1965 editions published under title: The American frontier; Includes bibliographical references
ER  -