lower right in graphite: Howard Cook 1930; lower left in graphite by unknown hand: 75 (circled) / Engine Room 1930; lower right in graphite by unknown hand: S
(Bethesda Art Gallery, MD); Reba and Dave Williams, Greenwich, CT, 1982; gift to NGA, 2008
- Duffy, Betty and Douglas. The Graphic Work of Howard Cook: A Catalogue Raisonné. Maryland: Bethesda Art Gallery, 1984, p. 103, no. 128.
- Beall, Karen F. and David W. Kiehl. Graphic Excusrions: American Prints in Black and White, 1900-1950, Selections from the Collection of Reba and Dave Williams. David R. Godine, Boston; American Federation of Arts, New York, 1991: 29.