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hi, for calculus i-iii, i think the standard textbook most undergrad schools use is James Stewart's Calculus, 5th ed, that one book is used for all three courses, 1st portion differential, 2nd portion integral, 3rd portion multivariable. i'm sure you can try to find used ones on ebay/half.com, and personally i'd try the school bookstore, they should sell used copies?? if you're still in school that is.
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