US Defense Department, ‘Submarine communications shore infrastructure.’ 10 February 2004. Tags: Ainslie Archive Box 6 Extremely Low Frequency Messaging systems Submarines
Federation of American Scientists, ‘Improved emergency message automated transmission.’ 28 April 2004. Tags: Ainslie Archive Box 6 Federation of American Scientists Messaging systems
General Dynamics, ‘Direct messaging system.’ 18 April 2004. Tags: Aerospace Ainslie Archive Box 6 General Dynamics Messaging systems Messaging sytems
