Handwritten postcard from E. Barnard to Charles F., Sr., thanking Brush for sending latest gravitation paper. Includes front of postcard which is pict Show moreHandwritten postcard from E. Barnard to Charles F., Sr., thanking Brush for sending latest gravitation paper. Includes front of postcard which is picture of University of Chicago telescope Charles F. Brush, Sr., Papers Series 1: Correspondence Subseries 2: Acknowledgments (1921-1929) Box 2 Folder 13 Show less
Handwritten letter from E. Barnard to Charles F., Sr., thanking Brush for sending latest gravitation paper Charles F. Brush, Sr., Papers Series 1: Corre Show moreHandwritten letter from E. Barnard to Charles F., Sr., thanking Brush for sending latest gravitation paper Charles F. Brush, Sr., Papers Series 1: Correspondence Subseries 2: Acknowledgments (1921-1929) Box 2 Folder 14 Show less