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Maryland: A Guide to the Old Line State, the state’s entry in the Depression-era American Guide Series, mentions it:

> Old-fashioned fried chicken, Maryland Style, has attained nation-wide fame, though discriminating Free Staters often have difficulty in recogniz- ing the concoction of that name foisted on a gullible public outside the State. The standard recipe calls for a young chicken, cut into pieces, floured, and fried in deep fat. According to the oldest custom it is served on a layer of fried cornmeal mush or a crisp johnnycake with cream gravy poured over the cornbread but not over the chicken.

[jfengel]

Thanks for digging that up! Those "America Eats" projects are an absolute treasure trove.