Title: K. Ė. T︠S︡iolkovskiĭ, A.L. Chizhevskiĭ
Subjects: Friends and associates, Aeronautical engineering, Aerospace engineering
People: Aleksandr Leonidovich Chizhevskiĭ (1897-1964), K. T︠S︡iolkovskiĭ (1857-1935)