Typed letter from H. A. Garfield to Charles F., Sr., thanking Brush for sending to Garfield a copy of the paper, entitled Gravitation, by Brush Charle Show moreTyped letter from H. A. Garfield to Charles F., Sr., thanking Brush for sending to Garfield a copy of the paper, entitled Gravitation, by Brush Charles F. Brush, Sr., Papers Series 1: Correspondence Subseries 2: Acknowledgments (1921-1929) Box 3 Folder 8 Show less