Gapopko G. F. Aerial photography. In Russian (ask us if in doubt)/Gapochko G.F. Aerofotosemka.Publication of the Permanent Military-Scientific Conference of the Central Committee of the USSR Special Aeronautical Chemistry: Publication of the Artillery Academy of the USSR 1933. 4, 82, 1 p.. SKUalb85d7937f4c5588c1.