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- united states (11)
- history (6)
- civilization, western (5)
- english language (5)
- college readers (4)
- rhetoric (4)
- problems, exercises, etc (3)
- report writing (3)
- democracy (2)
- politics and government (2)
- readers (2)
- sources (2)
- (student' (1)
- astronomy (1)
- astrophysics (1)
- authorship (1)
- book) (1)
- business (1)
- c2004 (1)
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