The Richard Diebenkorn Foundation has a new website! Please visit diebenkorn.org.
https://lccn.loc.gov/81013076Whitney Museum of American Art. Drawing acquisitions, 1978-1981 / Paul Cummings. New York : Whitney Museum of American Art, c1981. 64 p. : ill. ; 22 cm. NC108 .W47 1981 ISBN: 0874270340 (pbk.)