Mathematics: CALCULUS

Published in 1991 by Wellesley-Cambridge Press, the book is a useful resource for educators and self-learners alike. It is well organized, covers single variable and multivariable calculus in depth, and is rich with applications. There is also an online Instructor's Manual and a student Study Guide.

COW is an internet utility for learning and practicing calculus.
The COW library is organized into books, chapters and sections, with "modules" covering topics generally found in the corresponding part of a calculus text.