While browsing the ODOT website, I ran across some maps that I hadn't found before, in a systematic index anyway.
Here are 2 links you may want to save (this software converted the links to the same visible name, but they are different):
Oklahoma Maps
Oklahoma Maps
The highway maps run from 1873 to current. Some include the backside with various images.
Here's are screen captures of Oklahoma City from the backsides of the 1929 and 1931 state highway maps. The most significant change: the oil fields
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