lower center in plate: RSA; lower left in graphite: 3rd state 3 proofs; lower center in graphite: Robert Austin '31
Rachel Austin and Clare Calder (the artist's daughters); acquired 2012 by the National Gallery of Art
- Drawings and Prints by Robert Sargent Austin, with a Complete Catalog of His Prints. London: Fine Art Society, 2001, no. 93.