lower left in graphite: IV Cologne Landscape #3; lower right in graphite: 2/16 Ralston Crawford / by unknown hand, L51.5; by unknown hand, lower right verso in graphite, L51.5
by descent to Neelon Crawford, artist's son, New York; gift to NGA, 2000
- Freeman, Richard B. The Lithographs of Ralston Crawford. Univ. of Kentucky Press, 1962.