Marsden Hartley. Marsden Hartley letter to Helen Stein, 1936 December 12. Helen Stein papers relating to Marsden Hartley, [undated] and 1934-1949. Archives of American Art, Smithsonian Institution.
Marsden Hartley. Marsden Hartley, Bangor, Me. letter to Helen Stein, East Gloucester, Mass., 1939 September 29. Helen Stein papers relating to Marsden Hartley, [undated] and 1934-1949. Archives of American Art, Smithsonian Institution.
Marsden Hartley. Marsden Hartley to Rockwell Kent, 1912 Sept. 22. Rockwell Kent papers, circa 1840-1993. Archives of American Art, Smithsonian Institution.
Marsden Hartley. Marsden Hartley, New York, N.Y. letter to Milton Avery, ca. 1960. Milton Avery papers, 1926-1982. Archives of American Art, Smithsonian Institution.