Note by the digital editor : These Document forms part of a series of documents which
have been brought back to Germany from the camp at Tertre. The prisoners
obviously have worked in one of the many coal mines in the Borinage, Belgian
province Hainaut. The abbreviation B.O. points to the coal-mining region Borinage near french boarder.
Further information is to be found on the websites CHARBONNAGES DU HAINAUT (history of coal mining in Hainaut), TERTRE, GERMAN WAR-PRISONERS IN BELGIUM