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Physics 21/23/25: (Physics by: Giancoli 6th) $100
Chem 33/35/ 131: (Organic Chemistry: Vollhardt 5th) $62
Econ 1A: (Economics 6th, by Taylor) $60
(Not world crisis edition, but almost identical; you can check it out beforehand,)
Chem 31A/B: (Chemistry Structure & Dynamics: Spencer) $50
Stats 60/ Psych 10: (Basic Statistics for the Behavioral Sciences) $75
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