DS, in German, two pages, 8.5 x 12, Heerdt-Lingler letterhead, June 19, 1940. Letter to the chief doctor at the Buchenwald concentration camp about the qualities and uses of Zyklon-B gas. Document makes it specifically clear that its purpose is the disinfection of military barracks and rodents. It also explains that when used in a barracks, the troops must vacate for two or three days. In fine condition, with a light shade of toning and punch holes to left edges. RRAuction COA.
