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Hmmmm, I haven't heard of my favorite on here I used the REA one (Amazon.com: AP United States History (REA) - The Best Test Prep for the AP Exam: 7th Edition (Test Preps) (9780738602189): J. A. McDuffie, G. W. Piggrem, Steven E. Woodworth, Gregory Feldmeth: Books) for APUSH.