Avances del saber
Avances del saber [ciencia, técnica, cultura].
- 4. ed.
- Barcelona Editorial Labor 1971.
- 2 v. ill. (part col.) fold., col. maps.
Civilization, Modern--Addresses, essays, lectures.--1950-
Encyclopedias and dictionaries , Spanish.
Civilization, Modern--Addresses, essays, lectures.--1950-
Encyclopedias and dictionaries , Spanish.