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Chuck RJoe: Yes, this is Burdick's catalog. The edition you got (1953) is hard to come by. There are two earlier editions that are even harder to come by. The edition most people refer to is the 1960 edition. Those can be had on eBay but are becoming a little pricey. A more cost effective way is to get one of the paperback reprints. One was done in 1967 and there were one or two others later. The ACC itself was never updated after the 1960 edition, but a group of old time collectors (headed by Buck Barker I think) kept Burdick's Card Collector's Bulletin going for quite a while after 1960. In the Card Collector's Bulletin, newly discovered sets were designated with new ACC numbers, I guess in anticipation of a new edition that never occurred.