Category:Keystone NK
1920s American naval training aircraft  | |||||
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English: Keystone NK
Media in category "Keystone NK"
The following 3 files are in this category, out of 3 total.
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Keystone NK-1.jpg 575 × 414; 63 KB
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Keystone Pup L'Air September 1,1928.jpg 1,328 × 710; 181 KB
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Keystone XNK-1 Le Document aéronautique February,1929.jpg 1,352 × 598; 166 KB
