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Views of Earth's Past

 

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HELPFUL LINKS

1. US Geological Survey

2. PA's Geologic History

3. NASA

4. Discovery News

5. The Weather Channel

6. How Stuff Works

7. Smithsonian

8. National Geographic

9. The History Channel

10. Pitts. Post Gazette

11. Beaver County Times

 

165 million years ago footprints looked quite different.

 
 

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