I remember from my days as a kid with a bicycle in the late 50's hitting up gas stations near and far for free road maps, and how even interest in those pre-existed the DX hobby. Others here may have experienced the symbiosis too; the distances and the exploration curiosities blending with the instincts.
For some of those maps -- 'Mobilgas' was one -- came with a brief list of radio stations. New York State maps would have the major cities and 3 or 4 stations listed for each. I vaguely recall seeing a WROW 590 listed, for example, under a heading for 'Albany'. It was very long ago......
This thread is the first time I ever read of Rand McNally publishing a radio station guide. To me, they and HM Gousha and AAA and Hagstrom's stuck to maps. I looked up a bit and found that Rand McNally was the main company to've done Mobil's cartography. So RMc probably goosed up their association (plus their own) by throwing in a few freebies.
My Dad worked for Socony/Mobil for almost 40 years, which merged with Eastern States Standard Oil/ESSO/later Exxon. Perhaps someone aboard here will recall if Esso maps were others with those little radio station lists.
Are there any Sinclair or Cities Service, 76 Union, Gulf or Shell map users out there who give a Flying A about the topic?