Will Vesper, 1882-1962

http://www.polunbi.de/pers/vesper-01.html

Biographie

Accumulatoren Fabrik - Varta

http://wayback.archive.org/web/20071006090743/http://www1.historisches-centrum.de/zwangsarbeit/accu.htm

This website provided a catalogue with lists of civil worker camps, prisons and states institutions during the Third Reich and World War II in Hagen

http://universaar.uni-saarland.de/journals/index.php/tg/article/viewArticle/548/587

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