Acc.. 2012.105 includes letters and postcards, 1941-1944, by prisoners from Auschwitz to their families.
Acc. 2012.107 includes envelopes and letters, 1942-1944, sent by concentration camp prisoners from Sachsenhausen, Mauthausen, Ravensbrueck, Dachau, Gusen and Auschwitz
Stationary was provided by the camps and incudes rules of communication and also states for example that visits and packages were prohibited. The correspondence was strictly censored and excludes criticism or realistic descriptions of the conditions in the camps.