Thanks, everyone, that is most helpful.
The reason for not doing PDF was that many of these books will be sold. Iit seems that people get the idea that PDFs (even bought ones) are somehow free to distribute to others. I know, if anyone wants, they can pass on an epub, but most are less inclined to do so. Anyway, I'll give that some further thought.
Thanks, Tex2002ans, for the links and explanations.
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