Handwritten letter from unknown author to Charles F., Sr. thanking Brush for sending his fifth paper on gravitation to unknown author. Charles F. Brush Show moreHandwritten letter from unknown author to Charles F., Sr. thanking Brush for sending his fifth paper on gravitation to unknown author. Charles F. Brush, Sr., Papers Series 1: Correspondence Subseries 2: Acknowledgments (1921-1929) Box 3 Folder 3 Show less
Typed letter from Munson Havens to Charles F., Sr. thanking Brush for sending his fifth paper on gravitation to Havens. Charles F. Brush, Sr., Papers Se Show moreTyped letter from Munson Havens to Charles F., Sr. thanking Brush for sending his fifth paper on gravitation to Havens. Charles F. Brush, Sr., Papers Series 1: Correspondence Subseries 2: Acknowledgments (1921-1929) Box 3 Folder 3 Show less
Typed letter from Frederick A. Henry to Charles F., Sr. thanking Brush for sending his fifth paper on gravitation to Henry, who thinks the paper has a Show moreTyped letter from Frederick A. Henry to Charles F., Sr. thanking Brush for sending his fifth paper on gravitation to Henry, who thinks the paper has a vital relation to the constitution of the Cosmos. Charles F. Brush, Sr., Papers Series 1: Correspondence Subseries 2: Acknowledgments (1921-1929) Box 3 Folder 3 Show less