"Luftskib." . . "Flyvemaskiner" . . "Antiluftskyts." . . "Luftforsvar" . . . . . . . . . . "Textbook of Naval Aeronautics, etc. [With illustrations.]"@en . . . . . . . . "Textbook of Naval Aeronautics" . "Textbook of naval aeronautics : With introduction by rear admiral Bradsley A. Fiske" . . . . . . . . . . "Textbook of naval aeronautics"@en . "Textbook of naval aeronautics" . . . . . . . . . . . "Luftkrig." . . "1. Verdenskrig." . . "Ubåd." . . "Flyvevæsen." . . "Flåden" . . . . "1914 - 1918" . . "Aeronautik" . . "Motorer." . . "Artilleri." . . "Teknologi" . . "Mandskab" . .