Calculus with analytic geometry

As one of many people who were daunted by math texts that were poorly written, confusing, stuffed with pictures and meaningless examples, and plagued with mistakes and wrong answers in the back, I say "Thanks" to Louis Leithold for writing well crafted, well ordered, relevant, and challenging yet comprehensible math texts. Even though I was able to get good grades in all my math classes, there were many times when I simply didn't understand why the things I was doing worked.