The collection consists of Spaeth's works, correspondence, diaries, photographs, scrapbooks, and printed matter. His works--notes, outlines and lectures for English courses at Princeton, addresses on educational, literary, and scholarly topics, and poetry--comprise the great bulk of the collection, but it also includes professional and personal correspondence as well as several diaries and copybooks (1938-1952) containing notes on summer reading, thoughts on his trip to Germany (1938), and comments on the international situation prior to World War II. In addition, there are photographs, including one of John Ruskin, scrapbooks, offprints of articles written by Spaeth, other printed material, souvenir programs, and newspaper clippings.