Air. Aerology no. 10: Free-air data at Broken Arrow, Okla., Drexel, Nebr., Ellendale, N. Dak., Groesbeck, Tex., Leesburg, Ga., and Royal Center, Ind., aerological stations, Oct.-Dec. 1918, by Aerological Division, Willis Ray Gregg, in charge; Groesbeck aerological station, by Thomas J. Chancellor; Leesburg aerological station, by Frank T. Cole.

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