Aerology. Instructions for making aerological observations by means of kites, airplanes, sounding balloons, limited-height sounding balloons, free-rising captive balloons, ceiling balloons.
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Aerology. Instructions for making aerological observations by means of kites, airplanes, sounding balloons, limited-height sounding balloons, free-rising captive balloons, ceiling balloons.
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Aerology. Instructions for making aerological observations by means of kites, airplanes, sounding balloons, limited-height sounding balloons, free-rising captive balloons, ceiling balloons.
(Circular P, Aerological Division.) [Supersedes Publication 740, Instructions for aerological observers, 1921.] * For Sale by Superintendent of Documents. Paper, 40c.
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* For Sale by Superintendent of Documents. Paper, 40c.