<span>Typed letter from Charles S. Howe to Charles F., Sr., thanking Brush for sending a copy of his fourth paper on </span><span>gravitation to Howe.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

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