This is a set of books for Math 51. The first is "Vector Calculus" 3rd Edition by Colley and the second is "Linear Algebra" by Levandosky. These books were both bought new and barely used since I dropped the class so they are in excellent like new condition (no tears, etc). At $100 for the set, this is cheaper than you could even get just a used version of the vector calc book for at the bookstore (assuming there are any left). Make me an offer if you think another price is more fair. Thanks for looking.