Prakticheskai︠a︡ aėrodinamika vertoletov /
Romasevich, Vi︠a︡cheslav Fedorovich.
Erickson, John,1929-2002,former owner.StEdNL
Erickson, Ljubica,former owner.StEdNL
Samoĭlov, German Alekseevich.
Moskva : Voenizdat,
1980.
Bibliography: p. 381.
John and Ljubica Erickson collection.
Helicopters