Espenhorst, Jürgen: The Eye of the Army: German Aircraft and Aero Cartography in World War I, in: Liebenberg, Elri / Demhardt, Imre Josef / Vervust, Soetkin (eds.): History of Military Cartography (Lecture Notes in Geoinformation and Cartography), Dordrecht 2016 Springer International Publishing, pp. 61-82.
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