Nieuport 21 - AbsoluteAstronomy.com

Nieuport 21

Encyclopedia

Sources

Keskinen, Kalevi; Partonen, Kyösti and Stenman, Kari: Suomen Ilmavoimat I 1918-27, 2005. ISBN 952-99432-2-9.
Donald, David: The Encyclopedia of World Aircraft, Aerospace Publishing, 1997. ISBN 1-85605-375-X.

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