TY  - BOOK
AU  - Royston,Angela
TI  - Soft and hard
SN  - 9789719968399
U1  - 500 
PY  - 2013///]
CY  - Quezon City
PB  - Lumina
KW  - Science
KW  - Juvenile literature
KW  - Hardness
KW  - lcgft
N1  - Includes index
ER  -