TY  - BOOK
AU  - CROWTHER (J G)
TI  - Discoveries and inventions of the 20th century
U1  - 539/22 
PY  - 1955///
CY  - London
PB  - Routledge & Kegan Paul
KW  - inventions
KW  - Discoveries
KW  - century
KW  - 20th
ER  -