United States Holocaust Memorial Museum Collection, Gift of Eric Rapp Funding Note: The cataloging of this collection has been supported by a grant from the Conference on Jewish Material Claims Against Germany. Eric Rapp donated the Albert Rapp postcard to the United States Holocaust Memorial Museum in 1992. Written by Albert Rapp (donor's father) to Mathilde Rapp (donor's mother) in Frankfurt, December 1938, Buchenwald concentration camp.