lower center in plate: RSA; lower left in graphite: 1st state 3 proofs; lower right in graphite: (undeciphered) 28 Apr. 1934
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. 105.