Tied, free and controlled balloons

Pomortsev, M.Binded, free and controlled balloons = Ballon Captif, Ballon Libre et Ballon Dirigeable: Mechanical conditions for their equilibrium and movement / Fund.regiment.M. Pomortsev.- St. Petersburg: Type.or T.V.A.Tikhanova, 1895. -[2], II, 83 p., 4 l.Ill., cards.: table .. -Tit.l.and region.paralle.on Russian.and fr.ulcer.Bibliogr.In the settling.Note .. - (Dep.- Ex.: With gifts.the inscription "Julia Mikhailovich Shokalsky.".I. Shokalsky, Julius Mikhailovich.1.People (collection).Electronic copy source: PBOriginal storage: RGO