TY  - BOOK
T1  - The Idea of Progress in America, 1815-1860
A1  - Ekirch, Arthur Alphonse
PP  - New York
PB  - Columbia University
YR  - 1944
UL  - http://vufind10-pruebas.sigbunlp.bibliotecas.unlp.edu.ar/Record/dun.154254
OP  - 305
ER  -