TY  - BOOK
AU  - Langer,William Leonard
TI  - An encyclopedia of world history: ancient, medieval, and modern, chronologically arranged 
SN  - 0395135923
U1  - 903 
PY  - 1972///
CY  - Boston, MA.
PB  - Houghton Mifflin
KW  - Historia universal
KW  - Diccionarios
ER  -