I can get a history of everything I've combined.
Oddly, I can get statistics and cook books to help with that.
But I can't remember any of the other items I've used.
I can't find "Better homes and campgrounds" for decorating advice
I can't find any books on animal training. Sheesh, can't we "shine some light" on that subject

(And I'm still looking for a beginner level, introduction to combinatorics / statistics textbook, by the way.)