XR-9 (航空機) (Japanese Wikipedia)

Analysis of information sources in references of the Wikipedia article "XR-9 (航空機)" in Japanese language version.

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Global rank Japanese rank

934^th place

57^th place

google.co.jp

books.google.co.jp

Merriam, Ray. "World War II Journal #15: U. S. Warplanes of World War II, Volume 1." Bennington, Vermont: Merriam Press, 2002. ISBN 1-5763-8167-6. p64