<span>Typed letter from Frederick A. Henry to Charles F., Sr., thanking Brush for sending a copy of the address on Kinetic theory of gravitation </span><span>given by Brush at the Franklin InstituteCharles F. Brush, Sr., PapersSeries 1: CorrespondenceSubseries 2: Acknowledgments (1921-1929)Box 3Folder 6</span>

Acknowledgements for Brush's address "Some Experimental Evidence Supporting the Kinetic Theory of Gravitation," delivered at the Franklin Institute upon Receiving Franklin Metal, May 16, 1928

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