Letter from SS Untersturmführer Dr. August Becker to SS-Obersturmbannführer Walter Rauff on the Use of Gassing Vans (May 16, 1942),
published in: German History in Documents and Images,
<
https://germanhistorydocs.org/en/nazi-germany-1933-1945/ghdi:image-5233>
[December 20, 2024].