Here are a few pictures that were taken at the Red Oaks Mill Airport when it was a thriving concern. In the photo of the old couple (my favorite) and the Trimotor, the biplane to the right is Captain Johnny Miller's New Standard D25. They were taken by the grandfather of a friend of mine, who has since passed.
History from Local Pilot Charles Conklin
There were weekly "airshows" and I remember one, in particular, the Ford [Tri-Motor], an American Airline Curtis Condor, a Fokker D-8, a Spad, and several other biplanes. Also, there was a German pilot who was an ace from World War 1.
Every one of these airplanes was Short Takeoff and Landing (STOL) like maybe 300 to 400 feet. I rode in the EAA Ford, in the right-hand seat, and actually flew it for 10 to 15 minutes. A Sherman tank with wings.
I would guess (it was the) the early to mid-30s. The German ace ended up in the Luftwaffe. He survived World War 2.