I was wondering.
Contributors: World Book, Inc.
Publisher: World Book
Published: 1991
Place of publication: Chicago
Language: eng
Number of pages: 256
Subjects: Science -- Miscellanea -- Juvenile literature.; Science -- Miscellanea.
Other titles: Childcraft.
Notes: Includes bibliographical references (p. 245-246) and index.
"A supplement to Childcraft--the how and why library."