This is a multi volume reference now in its second edition, substantially revised and expanded from the 1972 original rather than reprinted unchanged, covering biblical and rabbinic literature, halakha, biography, communities, Israel and the Holocaust from antiquity to the present across denominations from Orthodox to Reform. That a full second edition was undertaken decades after the first, rather than a simple reissue, is itself part of its track record. This record has not independently traced every specific revision made between editions. It is a strong source for established historical, textual and biographical facts about Judaism and Jewish civilization broadly. Because it spans every denomination, a claim specific to one movement's own current practice is better confirmed against that movement's own statement rather than this general reference alone.