TY  - BOOK
AU  - Crowther, J.G..
TI  - Discoveries and Inventions of the 20th Century
U1  - 509 
PY  - 1955///
CY  - London
PB  - Routledge and Kegan Paul
KW  - Science and Technology
KW  - Discoveries-20th Century
KW  - Inventions-20th Century
KW  - G-Mathematics
ER  -