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2
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Earthquakes / by Ellen J. Prager ; illustrated by Susan Greenstein.
- 551.22 P8981e
- Prager, Ellen J..
- National Geographic,
- c2007.
- Washington, D.C. :
-
Volcano! / Ellen J. Prager ; illustrated by Nancy Woodman.
- 551.21 P8981v
- Prager, Ellen J..
- National Geographic Society,
- 2007.
- Washington, D.C. :