The collection contains primarily clipping scrapbooks of editorials from Seymour’s years as editorial manager at the New York World. The majority of incoming correspondence consists of readers’ letters regarding his editorial columns while in Chicago. Several prominent Chicago figures wrote to Seymour praising his editorials including John P. Altgeld, Marshall Field, Frank O. Lowden, George Pullman, John R. Walsh, and Booker T. Washington.

There is one personal scrapbook compiled by Seymour starting at age ten, and three photographs. There is also a small amount of outgoing correspondence to his daughters written while convalescing in Pasadena, a biographical manuscript written by daughter Louise, and materials collected from colleagues after his death also by his daughter Louise.