Differential Geometry of Curves and Surfaces
Manfredo Do Carmo
The content is well-presented and instructive. My main gripe with this book is the very low quality paperback edition. Had I not purchased this book on Amazon, my first thought would be that it is probably a pirated copy from overseas. After just a month of (careful) reading, many pages already falling out. The cover and content look as if they have been scanned and re-printed (in fact, this is probably exactly what happened).
