The correspondence includes letters from a variety of astronomers from around the world as well as general astronomy questions from members of the public. The correspondence also deals with women in astronomy and in the Beverly T. Lynds folder is a list of women members of the Astronomical Association of America. The majority of the letters written by Swope are retained copies. Notable correspondents include: Helmut Abt, Gonzalo Alcaino, Joseph Ashbrook, Robert Atkinson, Walter Baade, Horace W. Babcock, Ludwig Biermann, Bart J. Bok, Ira Sprague Bowen, Frederick Brasch, Laszlo Detre, Armin Deutsch, David H. DeVorkin, Laurence Fredrick, Cecilia and Sergei Gaposchkin, Helen Gilberts, Otto Heckmann, Arthur and Helen Hogg, Roberta Humphreys, Alfred H. Joy, Zdenek Kopal, Gerald E. Kron, Arlo U. Landolt, William Liller, Beverly T. Lynds, George C. McVittie, Donald H. Menzel, Delo Mook, Jan Hendrick Oort, L. Plaut, George Preston, Vera Rubin, Allan Sandage, Jan Schilt, T. Schmidt-Kaler, Martin Schwarzschild, Harlow Shapley, Elske Smith, Hyron Spinrad, Sidney Van den Bergh, Alexander Vyssotsky, Merle F. Walker, Sir Richard Woolley, American Institute of Physics, Astronomical Journal, Popular Astronomy, Royal Astronomical Society and the Smithsonian Astrophysical Observatory.The majority of the astronomical working papers deal with Swope's research and work on the Milky Way, M31 (Andromeda Galaxy), variable stars, cepheids, Magellanic Clouds, and the Draco System (these folders include notes, photographs and charts.) There are also four black and white photographs that may be of Swope receiving the Annie Jump Cannon Prize in 1968 and several miscellaneous manuscripts, reprints, articles by Swope and others, journals, bulletins, notes, pieces of ephemera and several hundred IBM cards.