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References
- ↑ ALLWARD, MAURICE F. (14 October 1948). "Tie-Rod Transmission". Flight: 458. Retrieved 25 November 2014.
- ↑ "Landgraf Model H-2". Stingray's List of Rotorcraft. Retrieved 25 November 2014.
- ↑ Eckland, K.O. (2008-08-15). "American airplanes: La - Li". Aerofiles.com. Retrieved 2011-02-14.