Georgia O'Keeffe, art and letters : [exhibition dates: National Gallery of Art, Washington, 1 november 1987 - 21 february 1988 ; the Art Institute of Chicago, 5 march - 19 june 1988 ; Dallas [...] / Jack Cowart ; Juan Hamilton. [The Exhibition "Georgia O'Keeffe: 1887 - 1987" is organized by the National Gallery of Art. Ed.-in-chief: Frances P. Smyth]. Washington : National Gallery of Art [u.a.], 1988