Ballistics of the future : with special reference to the dynamical and physical theory of the rocket weapons / J.M.J. Kooy and J.W.H. Uytenbogaart Cursus raketmechanica / J.M.J. Kooy : Dl. 2 Wat is zwaartekracht? / door J.M.J. Kooy Kosmos en mens / J.M.J. Kooy Cursus raketmechanica / J.M.J. Kooy : Dl. 1
