In 1986, Allyn and Bacon published my Denotational Semantics text, which I wrote while I was a post-doc in Edinburgh in 1982-83. The book sold steadily over the years, but Allyn and Bacon was purchased by William C. Brown, which was purchased by McGraw-Hill. McGraw-Hill deleted the text as soon as they acquired it.
When the book was deleted, its publication rights returned to me. I had no interest in revising and reprinting it, but from time to time I've mailed photocopies of the text to various people.
The requests for copies increased, so I salvaged the text's troff source and used groff to produce PS-files. With the help of others (please see below), the text is now available as a free download in both PS and PDF with the caveat that you get what you pay for. (-:
You are welcome to send comments/questions to me at das AT ksu.edu.
--- Dave Schmidt, November 2011