Albers, Josef, 1942 Select: Albers, Josef, 1942 Archipenko, Alexander, 1943 Select: Archipenko, Alexander, 1943 Calder, Alexander, 1942 Select: Calder, Alexander, 1942 Exhibition Correspondence, 1938-1981 Select: Exhibition Correspondence, 1938-1981 Exhibition Correspondence, 1947-1962 Select: Exhibition Correspondence, 1947-1962 Exhibition Correspondence, 1963-1967 Select: Exhibition Correspondence, 1963-1967 Exhibition Correspondence, 1979-1981 Select: Exhibition Correspondence, 1979-1981 Exhibition Correspondence, IBM Gallery of Arts, 1961-1962 Select: Exhibition Correspondence, IBM Gallery of Arts, 1961-1962 Feininger, Lyonel, undated Select: Feininger, Lyonel, undated Holtzman, Harry, undated Select: Holtzman, Harry, undated Membership Correspondence, Bulletins, 1944-1965 Select: Membership Correspondence, Bulletins, 1944-1965 Membership Correspondence, 1956-1979 Select: Membership Correspondence, 1956-1979 Mondrian, Piet, 1938-1942 Select: Mondrian, Piet, 1938-1942 Rousseau, Irene (President Emeritus, American Abstract Artists) letters, 1978-1982 Select: Rousseau, Irene (President Emeritus, American Abstract Artists) letters, 1978-1982 U.S. Committee of the International Association of Plastic Arts, 1961-1964 Select: U.S. Committee of the International Association of Plastic Arts, 1961-1964