I own multiple copies of the Alternity PH, GMG, Dark Matter book, Star Drive book and a few others in the line.
I started running an Alternity Fantasy game and since it is OOP, I didn't want my players to have to buy the books. So, I bought them for them and loan them out. I have enough for my players in PHs and a few extra GMGs in case they want to look at it. I got extras in some of the other books to potentially put into better bindings, such as a D ring binder with clear holders to show the pages better. Haven't gotten around to doing that yet, though.
I think I still have a first printing 2E PH and DMG and a 2nd printing, with the black covers. By then, my PH had lost its spine, although the book was still together. The DMG was mostly okay, but obviously worn.
That's it for specific books that I can think of. Good question! Thanks!
edg