This post was edited by Emanuel Linton on Dec, 2022
http://www.classzone.com/books/earth_science/terc/content/investigations/esu1... (now deprecated link)
http://web.archive.org/web/20071207160142/http://www.classzone.com/books/eart...
http://www.classzone.com/books/earth_science/terc/content/investigations/esu1... (now deprecated link)
http://web.archive.org/web/20071207160142/http://www.classzone.com/books/eart...
3727:12965
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