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This file has been used in: Neptun-Bad (in de). koeln-muelheim.de (2018-03-08). Retrieved on 2018-03-11. web.archives.org 2018-03-11: Copy on muelheim-heute.de, web.archive.org 2018-03-11: Copy on baeder.koeln-muelheim.de, web.archive.org

This file has been used in: Kölns buntes Veedel (in de). tma-bensberg.de / Thomas-Morus-Akademie Bensberg. Retrieved on 2018-12-16. web.archive.org

This file has been used in: "全面的卫生制度" (in zh). cityseeker.com. Retrieved on 2021-08-09. archive.ph 2021-08-09: PDF version, web.archive.org