The Combat History of 21. Panzer Division, Werner Kortenhaus.

The Combat History of 21. Panzer Division, Werner Kortenhaus. 
Looks at the history of the 'new' 21. Panzer Division and its battles in Normandy, against the Americans in Alsace and Lorraine and on the Eastern Front. Written by a veteran of the division, initially just after the war and then revised in 1989-90, this is an absolutely excellent unit history, covering these events from the German point of view, but without the sort of bias so often present in this sort of book.
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