See title. I'm curious to know when the first mentions of the holocaust were. I've seen some things to suggest they were long after WWII, and it took until the 70s for it to appear in encyclopedias and dictionaries. However on the contrary we have books like If This Is a Man by Primo Levi which was published in October 1947, only two years after he left Auschwitz, and published a few months earlier was Diary of a Young Girl in June of 1947. Are there any earlier? News reports, survivor accounts, whatnot?