David M. Helgren

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World Geography Today, Grades 9-12: World Geography Today
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Holt World Geography Today
Sager, Robert J.; Helgren, David M.

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World Geography Today
Helgren, David M.; Sager, Robert J.

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Rivers of Diamonds: v. 185 (University of Chicago Geography Research Papers S.)
Helgren

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People, Places and Change Annotated Teacher's Edition
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