TY  - BOOK
AU  - Taylor,George Rogers
TI  - The turner thesis: Concerning the role of the frontier in american history 
T2  - Problems in american civilization
AV  - E169.1 T87
PY  - 1949///
CY  - Boston
PB  - D.C. Heath
KW  - Turner, Frederick Jackson,
KW  - Estados Unidos
KW  - Historia
KW  - Filosofía
ER  -