Northrop N-3PB: Perbedaan antara revisi
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Baris 24:
* Ragnarsson, Ragnar R. "Phantom of the Fjords: Northrop's Flying Viking!" Granada Hills, California: Sentry Books, ''Wings,'' Vol. 11, No. 1, February 1981.
* Saunders, Reginald, S. J. ''Little Norway in Pictures: With Supplement, Norway – Yesterday and Today'' (Also on cover, ''R.N.A.F. in Canada''). Toronto: S. J. R. Saunders, 1944.
* Ulvensøen, Jon. ''Brennpunkt Nord
* Wiig, Erling. "Message of Liberty." Stamford, Lincolnshire: Key Publishing, ''Flypast'', No. 338, September 2009.
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