<span>Typed letter from H. Fredericks to Charles F., Sr., thanking Brush for sending latest gravitation paper, telling Brush Garfield would pass paper to </span><span>Williams College professor of physics W. McElfreshCharles F. Brush, Sr., PapersSeries 1: CorrespondenceSubseries 2: Acknowledgments (1921-1929)Box 2Folder 14</span>

Acknowledgements for Brush’s article, “Discussion of a Kinetic Theory of Gravitation, II, and Some New Experiments in Gravitation,” (1922 paper), 1922

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