He printed his books on his own printing press using a typeface that he designed himself; the works included La Parole est dans le désert (1920), Poemes de parole torrentielle (1927), L'Amour à Paris (1932), and Etincelles de mon enclume (1957). Duncan's work on his printing press featured in an interview at the academy for a 1955 documentary by Orson Welles, Around the World with Orson Welles: St.-Germain-des-Prés.
