Older Collectors, how did you communicate with other colletors?

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Posted By: Josh

After looking through several of the recent auction catalogues and drooling over all of the fantastic items, I began to wonder.
How did collectors such as Lionel Carter, Burdick, and other pioneers of the hobby communicate, besides writing to one another?

Specifically, the internet was not around yet, and from what I have gleened, there were no trade magazines. So how did kids, or even adults who collected cards, know of other collectors in other parts of the country, or even share information about sets, rarities, or tougher to find cards?
That sort of thing fascinates me, in terms of the early years of collecting.