While I don’t have Knuth’s books, I do have some of Apple’s original “Inside Macintosh” books on my bookshelf:
I bought them back in the late 80s and early 90s and they were like $50 each ($120 today) so I could only afford one or two a year. They were nearly useless without the full set, since so many referenced other volumes, and so complicated I never did learn Mac programming until REALbasic (now Xojo) came along in 1998.