TY  - BOOK
AU  - Murphy,Stuart J.
AU  - Smith,Cat Bowman
TI  - Dave's down-to-earth rock shop
SN  - 0060280182
AV  - QA248 .M78 2000
U1  - E MUR 
PY  - 2000///
CY  - New York, NY
PB  - HarperCollins
KW  - Set theory
KW  - Juvenile fiction
KW  - Rocks
N1  - "Level 3."; RL: 3
N2  - As they consider sorting their rock collection by color, size, type, and hardness, Josh and Amy learn that the same objects can be organized in many different ways
UR  - http://www.loc.gov/catdir/description/hc044/98032128.html
ER  -