January 15, 2018 Blue Hole Entrance, Castalia, Ohio (1940) E.B. Ackley | Curt Teich | Linen | c. 1940
January 15, 2018 One of the Many Beauty Spots at the Blue Hole, Castalia, Ohio (Date Unknown) Rich-Holt Co. | Curt Teich | Linen | c. 1930-1940s
January 15, 2018 The Gateway to the Blue Hole, Castalia, Ohio (1936) Standard Publications | Fort Wayne Printing Co. | Linen | c.1936
