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September 1938. "Making a purchase at traveling grocery store. Forrest City, Arkansas." View full size. 35mm nitrate negative by Russell Lee for the FSA.
The famous, long-running, and well-beloved "Lum & Abner" radio program (also set in Arkansas) featured a storyline in 1938 (same as this photo) in which the old-timers lost their "Jot-Em Down" general store and re-opened for business with an oversized monstrosity mounted aboard a touring car chassis.
From the photo it is obvious that such stores actually did exist in Arkansas at the same time. I can't help but wonder if this store, or one like it, may have provided inspiration for the storyline.
From the full-sized version of the picture I was able to make out the text:
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