<span>7 Typed and handwritten letters between Charles F., Sr., and Richard Fay, in 1920 Brush asking Fay to attempt to put mathematical equations to his gravitation theory and Fay's </span><span>equations, in 1925 and 1926 Fay writes with refined equations and new thoughts.Charles F. Brush, Sr., PapersSeries 1: CorrespondenceSubseries 3: Business and Professional (1876-1931)Box 4Folder 7</span>

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