<span>Typed letter from E. D. Campbell to Charles F. Brush, Sr., stating that Campbell received the reprint of Brush's </span><span>discussion on gravitation.Charles F. Brush, Sr., PapersSeries 1: CorrespondenceSubseries 2: Acknowledgments (1921-1929)Box 3Folder 1</span>

Acknowledgements for Brush's article, "Discussion of a Kinetic Theory of Gravitation, II, and Some New Experiments in Gravitation," (1923 paper), 1923

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