Typed letter from Charles K. Arter to Charles F., Sr., thanking Brush for sending his paper Kinetic Theory of Gravitation, III, to Arter. Charles F. Br Show moreTyped letter from Charles K. Arter to Charles F., Sr., thanking Brush for sending his paper Kinetic Theory of Gravitation, III, to Arter. Charles F. Brush, Sr., Papers Series 1: Correspondence Subseries 2: Acknowledgments (1921-1929) Box 3 Folder 4 Show less
Typed letter from Charles K. Arter to Charles F., Brush thanking Brush for sending a copy of his paper on Persistent Generation of Heat in Some Rocks Show moreTyped letter from Charles K. Arter to Charles F., Brush thanking Brush for sending a copy of his paper on Persistent Generation of Heat in Some Rocks to Arter Charles F. Brush, Sr., Papers Series 1: Correspondence Subseries 2: Acknowledgments (1921-1929) Box 3 Folder 5 Show less