Here’s a short list of interesting references that have been placed in the public domain. They are free, but worth much more!
(You might want to “Save Target File” locally to save the file to your own computer, rather than display it on your webpage)
KEYS IV… And More: The Finale – The final beautiful morse code key picture book from SK Dave Ingram, K4TWJ, who prior to his death released it as a free PDF as long as it was not used in a commercial site. It’s a beautiful book and it might interest or re-interest you into “The Wonderful World of CW”!
Zen and The Art of Radiotelegraphy – An excellent book that can be helpful in learning Morse Code as well as improving your proficiency.
Understanding Antennas For The Non-Technical Ham – A very nice non-technical discussion of “How Antennas Work”. It’s not The ARRL Antenna Handbook or the Antenna Engineering Handbook by Dr. John Volakis, but it is an easy yet informative read.