TY  - BOOK
AU  - Williams,George A., x
AU  - x
TI  - Physical science: x
SN  - x
U1  - 530/P578 
PY  - 1979///
CY  - London
PB  - McGraw-Hill
KW  - Science - Juvenile literature
KW  - Physics- Juvenile literature
N1  - Includes
ER  -