TY  - BOOK
AU  - Lehrburger,Egon
AU  - Elias,Gertrude
TI  - The true book about inventions
U1  - 609.2 23rd ed.
PY  - 1958///
CY  - London
PB  - Frederick Muller
KW  - Inventions
KW  - History
KW  - Inventors
ER  -