Flushing, New York, 23 May 1939 - Institutional correspondence Simon Guggenheim's and Dana C. Backus's form letter to ask for donations
Philadelphia, 3 May 1939 - Institutional correspondence The Medical Bureau and North American Committee's letter to the Exhibition Committee
Philadelphia, 10 May 1939 - Institutional correspondence A letter from the Medical Bureau and North American Committee to Evelyn Ahrend
1939 - Receipt Receipts for donation made to the Medical Bureau and North American Committee to Aid Spain Democracy