NASA NTRS · 19930084591
The "autogiro"
Abstract
For the first time in the world, a flying machine, heavier than the air and distinct from the airplane, has completed a circuit of four kilometers (nearly 2.5 miles) at a height of more than 25 meters (82 feet) above the ground.
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Moreno-Caracciolo, M. 1923-07-01. The "autogiro". https://ntrs.nasa.gov/citations/19930084591
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