Source of acquisition is the Aussenstelle Dahlwitz-Hoppegarten (branch Dahlwitz-Hoppegarten) of the Bundesarchiv (Federal Archive) Berlin, Germany; Files: ZB 6764 Hefter 1: ZB 6672 A.7. Files containing the maps/drawings are a part of a collection compiled by the former East German state security service. They were originally generated by the (Zentral-) Bauletiung der Waffen-SS und Polizei and were kept by the SS-Wirtschaftsverwaltungshauptamt. The United States Holocaust Memorial Museum received the filmed collection via the United States Holocaust Memorial Museum International Archival Programs Division in 2008.