Study No. 20: Even duration - unevenly divided (ca. 1909) -- Study No. 21: Some South-Paw Pitching! (ca. 1909) -- Study No. 22 (ca. 1912) -- Varied Air and Variations - Study 2 for Ears or Aural and Mental Exercise!!! (ca. 1923) -- Waltz-Rondo (1911) -- Three-Page Sonata (1905) -- Study No. 9: The Anti-Abolitionist Riots in the 1830's and 1840's (1908-1909) -- Three Quartet-tone Pieces for two pianos (1903-1923).