2 Typed letters, from Charles F., Sr., to W. Campbell and from Robert Aitken to Charles F., Sr., Brush asking Campbell about telescope sizes and astro Show more2 Typed letters, from Charles F., Sr., to W. Campbell and from Robert Aitken to Charles F., Sr., Brush asking Campbell about telescope sizes and astronomical photography, and Aitken thanking Brush for reprint of article concerning surface temperature of Mars. Charles F. Brush, Sr., Papers Series 1: Correspondence Subseries 3: Business and Professional (1876-1931) Box 4 Folder 4 Show less
