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If you've never read it before this book is a very intuitive introduction (and refresher): http://www.amazon.com/Calculus-Made-Easy-Silvanus-Thompson/d...

This book is currently out of copyright (published 1910):


Also available at the Gutenberg project, here: http://www.gutenberg.org/ebooks/33283

It seems to be a rather nifty book.

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