March 26, 2018 The Aerating Water Wheel at the Blue Hole, Castalia, Ohio (Date Unknown) R.G. Tremper Sales Co. | Curt Teich | Linen | c. 1930-1940s
March 26, 2018 Entrance to Blue Hole, Castalia, Ohio (Date Unknown) R.G. Tremper Sales Co. | Curt Teich | Linen | c. 1930-1940s
