Correspondence, manuscripts, diaries, commonplace books, drawings, photographs, and printed materials. The collection is a comprehensive documentation of the dramatist's career and includes manuscripts, typescripts, notes, and costume and scenic design for more than seventy of his plays and related writings; 31 diaries, commonplace books, and scrapbooks containing manuscript and typescript notes, travel sketches, original drawings, and photographs; and correspondence files including letters from Harley Granville-Barker, Sir Herbert Beerbohm-Tree, John Galsworthy, Booth Tarkington, and Thornton Wilder. Austin Strong's mother, Isobel Field, was the step-daughter of Robert Louis Stevenson. Consequently, the collection contains much Stevensoniana, including photographs and Isobel Field's letters from Western Samoa, where she was known as "Teuila." Also, correspondence and photographs relating to Cornwall Park, Auckland, New Zealand, which was designed by Austin Strong.

The Margaret Susan Daniell papers consist of biographical materials, a student notebook and drawings from her education at Parsons School of Design in the late 1920s, and two photographs. Daniell (1907-1998) studied fashion design at Parsons and later worked at Paramount Studios.

Mary Frances Gettrust graduated from the New York School of Art (later, Parsons School of Design) in 1939 with a diploma in Costume Design and Illustration, and served as an instructor of Costume Illustration at Parsons in the 1940s. The collection consists of a partial student notebook of costume sketches, printed samples of Gettrust's work as a fashion illustrator, correspondence from Parsons Alumni Association, and Parsons-related ephemera.