An Aviator's Field Book : Being the field reports of Oswald Bölcke, from August 1, 1914 to October 28, 1916 [electronic resource] /
Oswald Boelcke
- Project Gutenberg, 2009
- Project Gutenberg 30011 .
Public domain in the USA.
Electronic text
Boelcke, Oswald, 1891-1916 World War, 1914-1918 -- Personal narratives, German World War, 1914-1918 -- Aerial operations