United States. Department of the Army. ARMY AIRFIELD-HELIPORT DESIGN: GENERAL PROVISION AND CRITERIA.
Citazione stile Chigago Style (17a edizione)United States. Department of the Army. ARMY AIRFIELD-HELIPORT DESIGN: GENERAL PROVISION AND CRITERIA. U.S.G.P., 1965. (T.M. 5-823-1).
Citatione MLA (8a ed.)United States. Department of the Army. ARMY AIRFIELD-HELIPORT DESIGN: GENERAL PROVISION AND CRITERIA.
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