Ordnungspolizei : encyclopedia of the german police battalions : September 1939 / July 1942

A complete encyclopedia of all the German police battalions in service between 1939 and 1942. It includes all the details and specifications  of the forming of the units and the service of the units. It also includes specifications of their war crimes and their commanding officers and finally where they served. The work is researched in a very detailed way, with close to 500 footnotes.