These microfilmed cards have also been preserved in the collection held by the Arolsen Archives for Amersfoort and for the Herzogenbusch concentration camp/Kamp Vught. They were produced after the war by the independent information office known as the Afwikkelings Bureau Concentratiekampen (ABC). In December 1945 the ABC was incorporated into the information office of the Netherlands Red Cross, which is why these cards are now stored in the archive there.