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AlanContinuing with what Adam said, in the late 1970's, there was a great publication (as mentioned) "The Trader Speaks" as well as SCD (which was bi-weekly at the time). And, I think a publication called "Baseball Hobby News" was just beginning also. And, of course there were a large number of baseball card shows. It's funny - dealers' ads in publications used to be a phone number & fax number, now it's phone, email, website, mobile, etc,...
Alan