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Collection of Wheel Charts, Wheel Calculators and other Circular Ephemera, 1920-2005 (inclusive)
Held at: Lehigh University Special Collections [Contact Us]
Held at: Lehigh University Special Collections [Contact Us]
Held at: Chester County Archives [Contact Us]
Held at: Pennsylvania Horticultural Society [Contact Us]
Held at: Chester County Historical Society [Contact Us]
Held at: University of Pennsylvania: Architectural Archives [Contact Us]
Held at: Wagner Free Institute of Science [Contact Us]
Held at: Wagner Free Institute of Science [Contact Us]
Held at: Academy of Natural Sciences, Philadelphia [Contact Us]
Held at: Academy of Natural Sciences, Philadelphia [Contact Us]
Held at: Academy of Natural Sciences, Philadelphia [Contact Us]