- Subjects
- Published
-
Washington DC :
National Geographic
2006.
- Language
- English
- Main Author
- Item Description
- "Text revised from Simple machines in the National Geographic Windows on Literacy program from National Geographic School Publishing, c2002"--Title page verso.
- Physical Description
- 40 pages : color illustrations
- Bibliography
- Includes bibliographical references and index.
- ISBN
- 9780792259497
Contents unavailable.