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William F., "Sky Ships," New York, Crown Publications, p. 17, 1990, ISBN 0-517-56904-3 Grossnick, Roy A., "Kite Balloons to Airships. . . the Navy's Lighter-than-air...

5. Althoff, William F. SkyShips, New York: Orion Books, 1990, ISBN 0-517-56904-3, p. 4. Rankin, Lt. Col. USMC Robert H., 1958 "DN-1, The U.S. Navy's...

Navy Althoff, William F, SkyShips, New York: Orion Books, 1990, ISBN 0-517-56904-3, pgs. 4-5. "Archived copy" (PDF). Archived from the original (PDF) on...

Althoff, William F. (1990). Sky Ships. New York: Orion Books. ISBN 0-517-56904-3. Allen, Hugh (1943). The Story of the Airship (non-rigid). Akron, Ohio...

Navy Althoff, William F, SkyShips, New York: Orion Books, 1990, ISBN 0-517-56904-3, p. 6. Clark, Basil, The History of Airships, New York: St Martin's...

Althoff, William F. (1990). Sky Ships. New York: Orion Books. ISBN 0-517-56904-3. Vaeth, J. Gordon (1992). Blimps & U-Boats. Annapolis, Maryland: US...

102 Althoff, William F. Sky Ships. New York: Orion Books, 1990. ISBN 0-517-56904-3. Althoff, William F. USS Los Angeles: The Navy's Venerable Airship and...

Althoff, William F. Sky Ships. New York: Crown Publications, 1990 ISBN 0-517-56904-3 p. 17, "USS Shenandoah (ZR-1), Airship 1923–1925 -- Construction and...

Althoff, William F. (1990). Sky Ships. New York: Orion Books. ISBN 0-517-56904-3. Engelmann, Larry (July 1978) Close Encounter of Flight 101 American...

Atlas The Ultimate Weapon, Burlington Canada: Apogee Books, 2005, ISBN 0-517-56904-3, p. 11 Widnal Perair S., Lecture L14 - Variable Mass Systems The: Rocket...

Althoff, William F. (1990). Sky Ships. New York: Orion Books. ISBN 0-517-56904-3. Althoff, William F. (2009). Forgotten weapon: U.S. Navy airships and...