Yizkor Book ProjectYizkor (memorial) books document the history of Jewish communities destroyed in the Holocaust. Written in Yiddish, Hebrew, or both, they are a crucial resource for research in East European Jewish history, Holocaust studies, and Jewish genealogy; often, they include necrologies (lists of those who died), making them especially valuable for genealogical research. Visually, many of these books are extremely rich, featuring detailed maps, photographs, and illustrations.