Aerology no. 9:1, Free-air data at Broken Arrow, Okla., Drexel, Nebr., Ellendale, N. Dak., and Royal Center, Ind., aerological stations, July-Sept., 1918, by Aerological Division, Willis Ray Gregg, in charge; 2, Broken Arrow Aerological Station, by John A. Reihle; 3, Royal Center Aerological Station, by Homer W. Ball.

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