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There's also Bob Glickstein's Writing GNU Emacs Extensions: Editor Customizations and Creations with Lisp (https://www.amazon.com/Writing-GNU-Emacs-Extensions-C
by mcguire 6y ago
There's also Bob Glickstein's Writing GNU Emacs Extensions: Editor Customizations and Creations with Lisp (https://www.amazon.com/Writing-GNU-Emacs-Extensions-Customizations-ebook/dp/B0043M56SW https://www.amazon.com/Writing-GNU-Emacs-Extensions-Customiz...), which I found quite good at the time. But it's really old. On the other hand, I don't know if it's out of date. :-)