<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>