Recently, I found the archives of the Avalon Hill General, easily one of the most important publications when it came to the formation of modern wargaming.
Published by Avalon Hill, and devoted to their military games, it helped to link the many, many tiny cells of wargamers around the country.
As well as rules discussion, hints, tips and challenges, the General contained regional editors (fan volunteers), an index of local players and 'want ads' for play by mail games. From a pure marketing standpoint, it was brilliant: a collection of user-generated content that turned isolated players into a community of (Avalon-Hill-Buying) regulars.
It is also a really interesting look into the demographics - and the culture - of early wargamers. There are, as you might expect, a lot of high school boys, ex- or currently serving military men, and a few middle aged men. The list of active players in the newsletters is all male (although some women may be hiding behind initials), and virtually all with Western European surnames. Basically: white guys.