lower right in graphite: Edward Hopper; by unknown hand, lower left in graphite: The Locomotive $30.; by unknown hand, lower right verso in graphite: PMA
(Hirschl & Adler Galleries, Inc., New York); purchased 2006 by NGA.
- Zigrosser, Carl, ed. Prints; thirteen illustrated essays on the art of the print, selected for the Print Council of America. New York: Holt, Rinehart and Winston, 1962.