The private owner of this rare and important book asked for help in placing its contents online, so they could easily be viewed and searched by the public. The Center for Jewish History agreed to perform the digitization in exchange for the book's donation to YIVO, and the public now has access to this unique information from shortly before the Second World War. Because of the late date, broad coverage, and high percentage of Jews listed, this source may be especially useful for Holocaust-era research. The donor, Leibl Rosenberg, has added the following dedication:
This singular volume was dedicated to the general public by Leibl Rosenberg in loving memory of the members of the families Rozenberg from Lodz and Kalma from Kalisz, who together with the biggest part of Polish Jewry suffered terribly and perished horribly in the Shoah. May all their souls be bound up in the bundle of life.