Zygmunt Chamiec to Marcel de Valmalète, 26 January 1931 Box ii.7, Folder 1931, january Rare Book & Manuscript Library Serge Prokofiev Archive, 1917-2012Series II: Personal Papers, 1911-1947Subseries II.1: Personal and Professional Correspondence, 1911-1947
Zygmunt Chamiec to Sergei Sergeevich Prokofiev, 20 October 1931 Box ii.8, Folder 1931, october Rare Book & Manuscript Library Serge Prokofiev Archive, 1917-2012Series II: Personal Papers, 1911-1947Subseries II.1: Personal and Professional Correspondence, 1911-1947