An aviator̓s field book, being the field reports of Oswald Bölcke, from August 1, 1914 to October 28, 1916;
tr. from the German by Robert Reynold Hirsch, M.E., with a forward by Joseph E. Ridder, M.E.
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| Item Link | Original Source |
|---|---|
| Full view | University of California |
| Full view | University of California |
| Full view | University of Michigan |
| Full view | University of Wisconsin - Madison |