Hello, I was wondering if there is some interesting Calculus problem book with answers that I could use with Courant&John "Introduction to Calculus and Analysis" vol 1. I know there used to be a companion book by Albert Blank, but it seems like even used copies are very difficult to find (if anyone can tell me where/how I can get one, that would be perfect!). There is a Dover book by Ginzburg, but the reviews on Amazon seem to indicate that it's too basic. What other book could I use as a source of adequate exercises (from simple to very interesting), with solutions? Preferably not expensive, as I have some budget issues... Thank you!