SGML -- WWW sites

Since it took me a long time to scrounge up any SGML-related Web sites, I thought I'd share what I've found with y'all. If anybody knows of more, by all means please post! I hope someone finds these useful.
Glenda Jeffrey Email: Hibbitt, Karlsson & Sorensen, Inc Phone: +1 401 727 4200 1080 Main St. Fax: +1 401 727 4208 Pawtucket, RI 02860