Machines help us do work.

Title:

Personal Author EPSB:

Year Published:

2006

1900-1999

Series:

Volume:

Science

Physical Description:

24 p. col. ill. 21 cm.

Note:

Paperback. Fluent Plus level

Program Information:

Science

Subject:

Added Author:

ISBN:

9781426350689

Publisher:

Washington, D.C. : National Geographic Society, c2006.

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