TY  - BOOK
AU  - Gopal, Sarvepalli
AU  - Tikhvinsky, Sergei L.
TI  - History of humanity: Scientific and Cultural Development volume VII, the Twentieth Century 
PY  - 2008///
CY  - Paris
PB  - UNESCO Publications
KW  - Humanities
KW  -  History
N1  - Includes bibliographical references
ER  -