Memorandum, Chief of Station, Frankfurt to Chief, SR and Chief, EE, Some Operational and Political Implications Involved in the Re-establishment of Contact with CAWNPORE, May 16, 1952, Secret (1952)
RG-263, Entry ZZ-19 Subject Files (2nd Release), Box 10, Vol 10 Aerodynamic Operations (2 of 2), NA, CP.