I checked on Amazon, and these books seemed to be out of print, but a good review of Leach's book was listed. After a Google search on Leach's book, I found the web site at Georgia Wreck for his class. Seems that he just released a new edition and had a link to the publisher.I called the publisher (Customer Service) this morning, and they have the book and are sending me one to arrive in a few days (from Iowa). $60 plus tax plus shipping. (About $72 for me.)
Thought that I would pass this along in case anyone else is interested. They say that the book uses math. thru calculus plus complex numbers.
Leach also has a link to errata for all the editions, so if anyone here has an earlier version and wants the corrections, they are there.