TY  - BOOK
TI  - Avances del saber: [ciencia, técnica, cultura]
PY  - 1971///
CY  - Barcelona
PB  - Editorial Labor
KW  - Civilization, Modern
KW  - 1950-
KW  - Addresses, essays, lectures
KW  - Local
KW  - Encyclopedias and dictionaries , Spanish
ER  -