1998 Emacs article serie "Emacsulation" from slim[e] (common lisp) author Eric Marsden.

After Luke Gorrie's talk about SLIME origins and features, I dug for Eric Marsen (author of SLIME proto-prototype). According to http://edward.oconnor.cx/2006/01/emacsulation did an article series about Emacs around 1998. Links are dead redirection so here's the web.archive~proxy list:

1. on jka-compr (AKA auto-compression-mode
2. on networking, ange-ftp, w3, and crypt++
3. an introduction to ediff
4. on gnuserv
5. on customizing Emacs, including material on Custom
6. on abbrev, dabbrev, and completion

ps : Eric's webpage link section is full of things.