Looks like I have 101.5 (part of the Dolphy Acetate on Other Aspects) of the records listed in the book, plus a couple more as downloads. I sold a few that are on the list as well.
Also, it looks like around 84 of Colin's list (need to catch up!) are filed. I tried to get the Zorn/Takayanagi duo from Dusty Groove once, cheap IIRC, but someone beat me to it. Maybe that was Colin!
The reason given that the original book cut off in 1980 is that they didn't want to end up closely tied, personally, to any of the records included.
I'd definitely read a good follow-up book covering 1980-now.