Books Air Photo Evidence: Auschwitz, Treblinka, Majdanek, Sobibor, Bergen Belsen, Belzec, Babi Yar, Katyn Forest (1992)
(008274.77-E001840.93NAVRLOSUC20V)
https://archive.org/download/Air_Photo_Evidence/Air_Photo_Evidence.pdf
(008274.77-E001840.93NAVRLOSUC20V)