How on earth do you keep track of when things were published? The only books whose pub dates I know have titles like "Best SF of the Year 1986". I read so many used books that I'm generally completely ignorant of when they were written and/or first saw the light of day.

I might nominate Terry Carr's "Best SF of the Year" from 1984, though; it may not qualify, being an anthology, but I think it's the single book in my entire library that I have read and reread and rereread the most.