Douglas O-46 (Italian Wikipedia)

Analysis of information sources in references of the Wikipedia article "Douglas O-46" in Italian language version.

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archive.org

Francillon 1979, p. 134. (EN) René J. Francillon, McDonnell Douglas Aircraft since 1920, London, Putnam, 1979, ISBN 0-370-00050-1.
Armstrong 2005, p. 50. (EN) William M. Armstrong, Baltimore in World War II, Mount Pleasant, South Carolina, Arcadia Publishing, 2005, ISBN 978-0-7385-4189-1.