Breguet-Richet Gyroplane (Portuguese Wikipedia)

Analysis of information sources in references of the Wikipedia article "Breguet-Richet Gyroplane" in Portuguese language version.

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all-aero.com

«Breguet-Richet Gyroplane No.1». all-aero.com. Consultado em 2 de dezembro de 2020

aviastar.org

«Breguet-Richet Gyroplane No.1 helicopter - development history, photos, technical data». www.aviastar.org. Consultado em 2 de dezembro de 2020