N.B. The email exchange below may have been edited, e.g. to remove content not essential to the main point(s) or to standardize English spelling/grammar.
...My reference to the material now accessible did indeed cover the on-line books, which I discovered to my joy some months ago, including Proto-Germanic. ...are there plans to put more [books] up on the site...?
Regards, S. D.
Before any [of his] books could be published on the website, Dr. Lehmann had to get permission from the publisher -- that is, he had to get a "release," meaning the [book] publisher relinquishes its future rights. Dr. Lehmann had received a release for his book, The Development of Germanic Verse Form, so if anything more is added, that's probably next. (It's a matter of having a lot of time available to proof-read and correct the scanned text, since of course no electronic form now exists, and then convert it to HTML form.) I am not aware of any other releases for books likely to be of interest.
When Carol Justus died, she was working on an IE book; no print publisher had been contracted. I extended an offer to her husband to publish it online (thank goodness, it's in electronic form), but first he wants to seek a print publisher. So I'll do nothing there, pending future events.
I have no other prospects in sight, so this may be all.