United States Holocaust Memorial Museum Collection, Gift of George Langnas Received by Mignon Langnas (donor's mother), 1942-1943. The cards were in possession of Nelly Eckstein (Mignon's sister), 1949-1991. Inherited by Ernest Eckstein (Nelly's husband) after her death in 1991, 1991-2005. Bequeathed to George Langnas after Ernest's death in 2005. Donated to the United States Holocaust Memorial Museum in 2009 by George Langnas.