Ancestry.com has recently added the American Jewish Year Book for 5663 (October 2, 1902-September 21, 1903); the book for 1931-2 (5692) is also available online if you have a subscription. Search under "Family and Local Histories."
Among the highlights: biographical sketches of Commodore Uriah P. Levy and Jews in the 57th Congress, gifts and bequests ($500 and more) by Jews or to Jewish institutions, and awards given to Jews in America and abroad.
Ancestry erroneously lists the 1902-03 book as being for the year 5692 (which is actually the 1931-2 book), even though the scanned title page says "The American Jewish Year Book 5663." I will send them a correction comment.