He also got Parallax p/NeWS in his collection, which is super rare. I also wrote a person who has a SunDew QIC cassette, and another that has various NeWS sources (including the portable REF tree of the 1.1 version). Unfortunately they haven't released them yet, because of the unknown copyright situation. Another person has the OpenWindows 1.0 binary tapes for Sun-3 and Sun-4, among other stuff.

https://github.com/larsbrinkhoff/bagley-nottingham-tapes

For now we have the sources of NeWS 1.1 (and operators.h if you look more in depth) and X/NeWS 2.0. I also have the RBuss sources (an incomplete clone), but I have to ask the author if they can be put on the internet.

P.S: check BitSavers and Don Hopkins archives...