Boeing 247 (English Wikipedia)

Holcomb, Kevin. "The Boeing 247." Airminded.net webpage showing initial and final windshield angles and glare screen installation in the 247D, 2009. Retrieved: July 26, 2009.

aviation-history.com

"Boeing Model 247- USA." The Aviation History On-Line Museum, November 19, 2004. Retrieved: July 26, 2009.

"Accident Boeing 247 NC13345". Aviation Safety Network. Retrieved 20 January 2018.
"Accident Boeing 247 NC13324". Aviation Safety Network. Retrieved 20 January 2018.
"Incident Boeing 247 NC13328". Aviation Safety Network. Retrieved 8 April 2022.
"Incident Boeing 247D (C-73) 42-57210". Aviation Safety Network. Retrieved 20 January 2018.
"Accident Boeing 247 NC13314". Aviation Safety Network. Retrieved 20 January 2018.
"Accident Boeing 247D C-149". Aviation Safety Network. Retrieved 20 January 2018.
"Accident Boeing 247D C-140". Aviation Safety Network. Retrieved 20 January 2018.
"Accident Boeing 247 (C-73) 42-68639". Aviation Safety Network. Retrieved 20 January 2018.

"Model 247 Commercial Transport." Archived January 18, 2008, at the Wayback Machine boeing.com, 2009. Retrieved: June 14, 2010.

van der Linden 1991, pp. xi–xii.
van der Linden 1991, p. 93.
van der Linden 1991, p. 1.
Burrows, Stephen; Layton, Michael (2020). Top Secret Worcestershire. Brewin Books. p. 44. ISBN 978-1858586151.

McCutcheon, Kimble D. (July 3, 2015). "Pratt & Whitney Single-Row Radials (Wasp and Hornet)". Aircraft Engine Historical Society.

"247D Type Certificate" (PDF). Federal Aviation Administration. FAA. Archived from the original (PDF) on 28 December 2016. Retrieved 5 May 2016.

"Cheyenne, WY United Airlines Plane Crashes." Archived 2014-02-22 at the Wayback Machine Associated Press for Centralia Daily Chronicle (Washington), October 31, 1935. Retrieved: December 5, 2011.

Lednicer, David. "The Incomplete Guide to Airfoil Usage". m-selig.ae.illinois.edu. Retrieved 16 April 2019.

Pask, Alexander (11 September 2019). "Boeing 247: The First of Monoplane Firsts". internationalaviationhq.com.

Stokes, Keith. "Martin and Osa Johnson Safari Museum". kansastravel.org. Retrieved July 26, 2009.

"Boeing 247D". rcaf.com. 2009. Archived from the original on 21 May 2006. Retrieved 13 February 2021.

"NASM Boeing 247D." Archived November 24, 2007, at the Wayback Machine Wayback archive of NASM Boeing 247D, originally revised May 5, 2001. Retrieved: July 26, 2009.

"Aircraft Accident Report, December 15, 1936 crash." Archived August 23, 2011, at the Wayback Machine Department of Commerce. Retrieved: November 8, 2009.

"Boeing 247D." Archived 2009-04-22 at the Wayback Machine Canada Aviation and Space Museum Collection, 2009. Retrieved: July 26, 2009.

"Last Flight for Rare 1933 Boeing 247D Airliner". warbirdsnews.com. 14 April 2016. Retrieved 4 April 2018.

"Model 247 Commercial Transport." Archived January 18, 2008, at the Wayback Machine boeing.com, 2009. Retrieved: June 14, 2010.
"247D Type Certificate" (PDF). Federal Aviation Administration. FAA. Archived from the original (PDF) on 28 December 2016. Retrieved 5 May 2016.
"NASM Boeing 247D." Archived November 24, 2007, at the Wayback Machine Wayback archive of NASM Boeing 247D, originally revised May 5, 2001. Retrieved: July 26, 2009.
"Boeing 247D". rcaf.com. 2009. Archived from the original on 21 May 2006. Retrieved 13 February 2021.
"Cheyenne, WY United Airlines Plane Crashes." Archived 2014-02-22 at the Wayback Machine Associated Press for Centralia Daily Chronicle (Washington), October 31, 1935. Retrieved: December 5, 2011.
"Aircraft Accident Report, December 15, 1936 crash." Archived August 23, 2011, at the Wayback Machine Department of Commerce. Retrieved: November 8, 2009.
"Confetti on Lone Peak." Time, June 21, 1937. Retrieved: November 8, 2009.
"Boeing 247D." Archived 2009-04-22 at the Wayback Machine Canada Aviation and Space Museum Collection, 2009. Retrieved: July 26, 2009.

Johnson, Robert Craig (1996). "China's Air Forces in the Struggle Against Japan". worldatwar.net. Retrieved 2021-01-20.