Correspondence
The Correspondence series (1889-1977; 2.5 linear ft.) includes correspondence of observatory directors William J. Hussey, Ralph H. Curtiss, Heber D. Curtis, W. Carl Rufus, A.D. Maxwell, Leo Goldberg, Robert R. McMath, and R.A. Rossiter. Correspondents include Robert P. Lamont, Harlow Shapley, and Frank E. Robbins.
The Observatories series (1892-1985; 4.7 linear ft) is divided into five alphabetically arranged sub-series, representing the separate observatories operated by or affiliated with the university. Researchers should note that there is some overlap among the observatories within each of the sub-series.