Discover Our Collections Type > Text (remove) Specific Item Type > Folder (remove) Subject > Nuclear weapons (remove) Date > 1963-05-21 (remove) Limit your search Tag Digital item (1) Date 1963-05-21 (1) Subject Nuclear weapons (1) Type Text (1) Collection National Security Files (1) Series National Security Action Memorandums (1) Specific Item Type Folder (1) Time Period Presidential (Nov. 22, 1963-Jan. 20, 1969) (1) 1 results Folder, "NSAM # 245: High Yield Nuclear Weapons, 5/21/1963," National Security Action Memorandums, NSF, Box 2 (Item)