Memorandum # 340, U. S. Government Shipments by Foreign Flag Vessels in the North Vietnam Trade, 1/25/1966,
"NSAM 340 US Govt Shipments by Foreign Flag Vessels in North Vietnam Trade," National Security Action Memorandums, NSF, Box 7,
LBJ Presidential Library,
accessed March 18, 2024,
https://www.discoverlbj.org/item/nsf-nsam340