Loistl, S., & Schwanninger, F. (2017). Vestiges and Witnesses: Archaeological Finds from the Nazi Euthanasia Institution of Hartheim as Objects of Research and Education. International Journal of Historical Archaeology, 22(3):1-25. «Immediately after the castle was vacated in March 1940, alterations began, and the killing facilities were installed. This took about four or five weeks. The work was managed by Master Bricklayer Erwin Lambert, who was also activeinother euthanasia institutions (cf. Schwanninger 2011:119). After T4 was stopped, Lambert also participated in building the extermination camps of Aktion Reinhard - Belzec, Sobibor, and Treblinka (Klee 2003:354) (Fig. 1).»
