United States Holocaust Memorial Museum Collection, Gift of the Frohman familiy First set of letters written to David's parents in Chicago area. Second set of letters written to family friend Leandro Pastorelli in Chicago area, and given to David's son Clayton in 1964, on the occassion of Clayton's Bar Mitzvah. Donated to the United States Holocaust Memorial Museum in 2015 by Clayton, Douglas, and Myla Frohman.