<span>Typed letter from Newton D. Baker to Charles F., Sr., thanking Brush for sending his fourth paper on gravitation, which Baker thinks is important for its </span><span>consideration of composition of mass in calculating gravitational pulls.Charles F. Brush, Sr., PapersSeries 1: CorrespondenceSubseries 2: Acknowledgments (1921-1929)Box 3Folder 2</span>

Acknowledgements for Brush's article, "Discussion of a Kinetic Theory of Gravitation, II, and Some New Experiments in Gravitation," (1924 paper), 1924-1925 / Correspondence

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