List of Douglas DC-4 variants (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "List of Douglas DC-4 variants" in English language version.

refsWebsite

Global rank English rank

1web.archive.org

1^st place

1^st place

1uswarplanes.net

low place

low place

low place

low place

ruudleeuw.com

"The Douglas "swingtail" conversions". ruudleeuw.com.

uswarplanes.net

"DOUGLAS DC-4 / C-54 SKYMASTER". US Warplanes.net. Archived from the original on February 5, 2013. Retrieved December 17, 2012.

web.archive.org

"DOUGLAS DC-4 / C-54 SKYMASTER". US Warplanes.net. Archived from the original on February 5, 2013. Retrieved December 17, 2012.