"Keys IV" was the last book written by Dave Ingram K4TWJ before he became a Silent Key last year. According to his wife, Sandy, it was one of Dave's last wishes that the book be made available to anyone who would like to have it for personal use.
You can download it, as a .pdf file from http://www.k4twj.com/books.htm
It's a nice book, as evidenced by Dave's friendly, easy writing style.
72 de Larry W2LJ
QRP - When you care to send the very least!