Welcome to the SGML History Niche. It contains some reliable papers on the early history of SGML, and its precursor, IBM's Generalized Markup Language, GML.
At present, there are three papers:
Copyright ©1997 Charles F. Goldfarb. All rights reserved. Information on this site cannot be used or cited for any commercial purpose, although pointers to the site are welcome. Any questions, comments, or suggestions? Send me mail.