United States Holocaust Memorial Museum Collection, Gift of Mr. and Mrs. Ernest M. Grunebaum The letter was sent by Charlotte Hackett to her brother (donor's father) and was discovered by Ernest Grunebaum while going through his late father's papers. Ernest Grunebaum donated the material to the United States Holocaust Memorial Museum in 1991 Written by Isle Dahl (former roommate of donor's aunt) to Charlotte Hackett (donor's aunt), May 1939, France.