Light Observation Helicopter (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Light Observation Helicopter" in English language version.

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collectair.com

Remington, Steve. The Cessna CH-1 Helicopter Archived 2009-06-21 at the Wayback Machine. Collectair.com. Accessed on 30 June 2009.

Beechy, Robert. "U.S Army Aircraft Acquisition Programs". Archived 2006-11-18 at the Wayback Machine Uncommon Aircraft 2006. 18 November 2005. Accessed on 19 September 2006.

Michael J. Hirschberg and David K. Daley (7 July 2000). "US and Russian Helicopter Development In the 20th Century". Archived from the original on 27 September 2006.

Remington, Steve. The Cessna CH-1 Helicopter Archived 2009-06-21 at the Wayback Machine. Collectair.com. Accessed on 30 June 2009.
Spangenberg, George A. "George A. Spangenberg Oral History"^[usurped]. edited by Judith Spangenberg-Currier. pdf. Spangenberg.org. pp.187-190
Beechy, Robert. "U.S Army Aircraft Acquisition Programs". Archived 2006-11-18 at the Wayback Machine Uncommon Aircraft 2006. 18 November 2005. Accessed on 19 September 2006.
Michael J. Hirschberg and David K. Daley (7 July 2000). "US and Russian Helicopter Development In the 20th Century". Archived from the original on 27 September 2006.