Arbitrary question? I'm sure there are antiquarian book collectors who would say that the only book worth collecting is written before 1500, in mint condition, with hand tipped illustrations and so on ... well for most of us non- millionaire types, it's about collecting what you love. Do you like collecting books on a certain subject? Poetry? WWII? Victorian era? Share your interest with us! I love old cook books and even though I don't "collect" them I do buy and sell them. (feeds my addiction) I thought this one was really cool - The Mystery Chef Cook Book. This one is a 4th printing copy but the Mystery Chef goes back to1929.