Typed letter from George W. Crile to Charles F., Sr., thanking Brush for sending to Crile a copy of the fourth paper on the kinetic theory of gravitat Show moreTyped letter from George W. Crile to Charles F., Sr., thanking Brush for sending to Crile a copy of the fourth paper on the kinetic theory of gravitation by Brush Charles F. Brush, Sr., Papers Series 1: Correspondence Subseries 2: Acknowledgments (1921-1929) Box 3 Folder 7 Show less