Matches in DBpedia 2016-04 for { ?s ?p "The O-31 was Douglas Aircraft Company's first monoplane observation straight-wing aircraft used by the United States Army Air Corps."@en }
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- Douglas_O-31 abstract "The O-31 was Douglas Aircraft Company's first monoplane observation straight-wing aircraft used by the United States Army Air Corps.".
- Q5301852 abstract "The O-31 was Douglas Aircraft Company's first monoplane observation straight-wing aircraft used by the United States Army Air Corps.".
- Douglas_O-31 comment "The O-31 was Douglas Aircraft Company's first monoplane observation straight-wing aircraft used by the United States Army Air Corps.".
- Q5301852 comment "The O-31 was Douglas Aircraft Company's first monoplane observation straight-wing aircraft used by the United States Army Air Corps.".