Symbols for airport, hangars, radio stations, forbidden zones, and topographic symbols; specifications for ground marking.
International aeronautical maps, signs, symbols and conventional abbreviations
Carte aeronautiche internazionali. Segni, simboli ed abbreviazioni convenzionali
Rivista Aeronautica ; 6 , n 5
1930
16 pages
6 Figs.
Article (Journal)
Italian
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Recommendations for letter symbols, signs and abbreviations -- 3
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Recommendations for letter symbols, signs and abbreviations -- 4
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