Roxbury, 22 November 1955 - Institutional correspondence Alexander Calder's letter to Willem Sandberg, dated 22 November 1955
Roxbury, 12 January 1956 - Institutional correspondence Alexander Calder's letter to Willem Sandberg, dated 12 January 1956
San Sebastián, 2016 - Exhibition catalogue Catalogue for the exhibition 1937: On Guernica, War and Civitas at the Museo de Bellas Artes, Bilbao