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My first book, Geometric Algebra for Electrical Engineers is available in the following formats.

In black and white, for $15.50 USD (softcover), or $23 USD (hardcover.)
As a FREE (color) PDF.
As a leanpub e-book for $5+ (set your own price).  There is also a discussion forum for this book on leanpub, albeit unused.
As latex sources (see below.)

The softcover ....

United States , Wrenn Wooten , Nicholas Dwark , Jack Paladin , Zhengbang Zhou , Norman Derby , Peter Eriksen , Bruce Gould , Computer Algebra Software , Geometric Algebra , Electrical Engineers , Prof Normal , Tim Put ,