The movies advertised on the marquee, Teen Age Rebel and Stagecoach to Fury, both came out in 1956. The national park mentioned is the 24,000 acre Cumberland Gap National Park, which opened in 1959.
Colourpicture Publishers was in business in Boston between 1938 and 1969, but began using the Plastichrome trademark in the 1950s.
As far as I can tell, Adams Specialty Company in Nashville no longer exists.
Jack Inman is, or was, a photographer working in Middlesboro.