The Cryptographic Shakespeare
An alert reader pointed me to the web site of the book that I mentioned in a previous post. It turns out that the book is The Cryptographic Shakespeare, and that copies of the 2,000-copy print run in 1987 are readily available at reasonable prices if you look around on the Internet a bit.
On the other hand, most of the content of the book actually seems to be available on the late author's web site.
And it even looks like there was a subsequent book written on the same topic – The Second Cryptographic Shakespeare!