TY  - BOOK
AU  - Yardley,Alice
TI  - Discovering the physical world
SN  - 0590073273
U1  - 155.91 YAR 
PY  - 1970///
CY  - New York : 
PB  - Citation Press
KW  - Science
KW  - Study and teaching (Elementary)
KW  - Mathematics
N1  - Includes index
ER  -