FDR AND THE JEWS, by Richard Breitman and Allan J. Lichtman. (Belknap/Harvard University, $19.95.) What, exactly, did Franklin Roosevelt do during his presidency, from 1933 to 1945, to protect the Jews of Europe from Nazi genocide? This thorough revisiting of the record reveals a concerned leader whose efforts on behalf of Jews were significant yet whose moral role was tempered by the political realities of depression and war.