in unknown hand, lower right verso in graphite: Sillman: O & N WP10; in unknown hand, lower right verso, upside down, in graphite: WP10 O+N
Kathan Brown, San Francisco; gift to NGA, 2014
- Brodie, Judith and Adam Greenhalgh. Yes, No, Maybe: Artists Working at Crown Point Press. Exh. cat., National Gallery of Art, Washington, D.C., 2013: 127, pl. 31.1.