Tethered flight test (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Tethered flight test" in English language version.

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archive.org (Global: 6^th place; English: 6^th place)

Botting, D.; Books, Time-Life (1980). The giant airships. Epic of flight. Time-Life Books. ISBN 978-0-8094-3272-1. The first rigid airship ever to be flown was built in the 1890s with a skeleton and outer cover made of an exotic new metal: aluminum. The new ship, designed by David Schwarz, a Dalmatian timber merchant, lifted off successfully in a tethered test in Berlin on November 3, 1897...

Cooke, A.; Fitzpatrick, E. (2009). Helicopter Test and Evaluation. AIAA Education. Wiley. p. 103. ISBN 978-1-4051-7254-7.
Galison, P.; Roland, A. (2013). Atmospheric Flight in the Twentieth Century. Archimedes. Springer Netherlands. p. 81. ISBN 978-94-011-4379-0.

"Balzac VTOL Forerunner of the Mirage IIIV." Flight International, 2 August 1962. pp. 174-175.