Size: 355 items (on 1 microfilm reel).
Summary: Letters to Osborne and Simmons from friends, gallery owners, and colleagues, among others, including some about their use of synthetic resin paints; 83 photographs; 70 clippings, catalogs, essays and other printed materials. Correspondents include H. Daniel Webster, F. Valentine Dudensing, Walter M. Grant, Robert Henri, and Onya LaTour. Also included is one letter from Thomas Hart Benton to Mrs. Brett Osborne, daughter in law of Lue and Cordray. She had inherited their paintings and asked Benton's advice what to do with them.