TY  - BOOK
AU  - William Rudge; 
AU  - Bruce Drysdale
TI  - Let's explore science
T2  - vol 4
SN  - 0713610948
U1  - 507 R915l 
PY  - 1970///
CY  - London
PB  - A. & C. Black
KW  -  Science
KW  - Problems, exercises, etc
ER  -