The CyberWeb: resources for WWW developers - http://www.charm.net/~web/
Writing HTML Documents - http://oneworld.wa.com/htmldev/devpage/dev-page1.html
A Quick Introduction to Hypertext - http://www.ncsa.uiuc.edu/SDG/Software/MacMosaic/Docs/HypertextInt ro.html
A Beginner's Guide to HTML - http://www.ncsa.uiuc.edu/General/Internet/WWW/HTMLPrimer.html
Also from NCSA is another document by the same name (this looks like an older version.) http://www.ncsa.uiuc.edu/SDG/Software/Mosaic/ Demo/html-primer.html
Crash course on writing documents for the Web http://www.ziff.com/~eamonn/crash_course.html
How to write HTML files - http://curia.ucc.ie/info/net/htmldoc.html
HTML Documents: A Mosaic Tutorial - http://fire.clarkson.edu/doc/html/htut.html
HTML Quick Reference - http://www.ncsa.uiuc.edu/General/Internet/WWW/HTMLQuickRef.html
Composing Good HTML - http://www.willamette.edu/html-composition/strict-html.html
HTML, the complete-ish guide - http://www.gatech.edu/adam/docs.dir/html.html
HTML Documentation Table of Contents http://kepler.utirc.utoronto.ca:3232/HTMLdocs/ NewHTML/htmlindex.html
Hypertext Markup Language (HTML) RFC - http://info.cern.ch/hypertext/WWW/MarkUp/HTML.html
State of the Art Review on Hypermedia Issues and Applications - http://www.csi.uottawa.ca/~dduchier/misc/hypertext_review/
Index of authoring tools and filters for HTML - http://www.acns.nwu.edu/www-authoring.html
Another index of authoring tools and filters for HTML - http://info.cern.ch/hypertext/WWW/Tools/Word_proc_filters.html
Using the h hyperbook language http://siva.cshl.org/h/h.body.html - h, a simple hypertext markup language which, for the purpose of transforming a normal "textbook" or "tutorial" text into densely linked hypertext.