File:Zenith Albatross Z-12 Front View.tiff
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This work is in the public domain because it was published in the United States between 1929 and 1963, and although there may or may not have been a copyright notice, the copyright was not renewed. For further explanation, see Commons:Hirtle chart and the copyright renewal logs.
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References
- ↑ Don Parsons (March 2007). "Restoration: "That Big Biplane", 1929 Zenith Z6A". Air & Space Magazine 21. National Air and Space Museum. Retrieved on May 27, 2012.
- ↑ (August 1 2006). "An Albatross Around Their Necks: An Attempt To Build A Lightweight Tri-Motor". Air Classics 42 (8): 46. Challenge Publications Inc.. Retrieved on May 22, 2012.
- ↑ Westfall, Douglas Paul (2003) Story of The Town of Bolsa, Orange, California: Paragon Agency, p. 78 Retrieved on June 1, 2012. ISBN: 1-891-03038-8. OCLC: 52973607.