The Judson Council Sapp papers and collection of Rex Stout document Sapp’s efforts to create a comprehensive collection of first editions of all American publications of Rex Stout's works, as well as his participation with the Wolfe Pack and other mystery literary associations. The papers illustrate the strong following around Rex Stout's character Nero Wolfe and give insight into a world of fandom, amateur presses, and literary societies during the late 1960s to early 1980s.

Materials include correspondence with collectors, friends, and Stout-enthusiasts; vendor catalogs, fanzines, and mystery newsletters; Nero Wolfe ephemera such as fan artwork, film stills, broadsides, and audiovisual recordings of radio shows and television series; and Wolfe Pack correspondence, The Gazette: The Journal of the Wolfe Pack , and Black Orchid banquet ephemera. This collection also includes Sapp's correspondence with John McAleer, Rex Stout's official biographer, which documents their professional collaboration and friendship.