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Instructions for airways observers ... by Series: United States. Circular N, Aerological division ;
Edition: <2d ed.> 1932.
Material type: Text Text; Format: print ; Literary form: Not fiction
Publication details: Washington, U.S. Govt. Print., 1932
Availability: No items available.

2.
Instructions for airway meteorological service. by Series: Circular N
Edition: Third edition. 1935.
Material type: Text Text; Format: print ; Literary form: Not fiction
Publication details: Washington, U.S. Govt. print. off., 1935
Availability: No items available.

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