lower right in graphite: CO 70; lower left in graphite: gem. I; upper center in graphite: Eraser
- The Art of Collaboration: Works from the National Gallery of Art's Gemini G.E.L. Archive, Academy Art Museum, Easton, Maryland, 9 Dec 2006 - 3 Feb 2007.
- GEM 182.
- Platzker, David and Richard H. Axsom. Printed Stuff: Prints, Posters, and Ephemera by Claes Oldenburg: A Catalogue Raisonné 1958-1996. New York: Hudson Hills Press in Association with Madison Art Center, Wisconsin, 1997: 65