Fletcher Memorandum to Ladd: October 18, 1949 Belmont Memorandum to Ladd: May 15, 1950 Keay Memorandum to Belmont: September 29, 1950 Ladd Memorandum to the Director: October 16, 1950 Ladd Memorandum to the Director: February 28, 1951 Laughlin Memorandum to Ladd: August 31, 1951 Belmont Memorandum to Ladd: May 23, 1952 Belmont Memorandum to Ladd: June 23, 1952 Belmont Memorandum to Boardman: February 1, 1956 Belmont Memorandum to Boardman: November 26, 1957
