Set of 4 letters sent by different inmates from different concentration camps in different years: 1940,1942,1945. All written in German using letter stationery from KL Buchenwald, KL Mauthausen-Gusen, KL Dachau and KL Flössenburg, with the guidelines printed. All went through censorship as we can see on ink stamps. Perfect example of inmate letters for camp letter collectors.