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Instructions for aerological observers (1921)
United States. Weather Bureau, Cloud, W. S, Gregg, Willis Ray, 1880-1938, Jakl, Vincent Edward, 1880-, Lane, Russell Charles, 1893-, Samuels, Leroy Thomas, 1893- · Washington : Govt. print. off. · leaf 31
Fig. 23,— End view of Marvin kite meteorograph (S, frame; V', cylinder: Z, anemometer).Meteorology · Aeronautics in meteorology
Internet Archive · University of Illinois Urbana-Champaign · Public domain (published before 1931). Free to use for anything.
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