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Rotary engines /
prepared in the Office of the Director of Air Service ; August, 1919.

APA Citation

United States. Army. Air Corps. (1920). Rotary engines. Washington: U.S. G.P.O..

MLA Citation

United States. Army. Air Corps. Rotary Engines. Washington: U.S. G.P.O., 1920.

Warning: These citations may not always be complete (especially for serials).