lower left below image in graphite: 17 Drawings by Thoreau OK. to Print John Cage 1972
- Yes, No, Maybe: Artists Working at Crown Point Press, National Gallery of Art, Washington, D.C., 1 Sep 2013 - 5 Jan 2014.
- Brodie, Judith, and Adam Greenhalgh. Yes, No, Maybe: Artists Working at Crown Point Press. Washington, DC: National Gallery of Art, 2013, p. 79, pl. 10.1.