Murphy, Stuart J., 1942-

Dave's down-to-earth rock shop / by Stuart Murphy ; illustrated by Cat Bowman Smith. - New York, NY : HarperCollins, c2000. - 33 p. : col. ill. ; 22 x 26 cm. - MathStart .

"Classifying; Level 3."

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.

ISBN: 0060280182 0060280190 (lib. bdg.) 0064467295 (pbk.)

LCCN: 98032128

Subjects--Topical Terms:
Set theory.

LC Class. No.: QA248 / .M78 2000

Dewey Class. No.: 511.3/22