00411pab a2200121 454500008004000000100002400040245013100064260000900195300001500204362001100219650001300230773004600243180718b2008 xxu||||| |||| 00| 0 eng d aBoyd, Donald et al. aThe narrowing gap in New York city teacher qualifications and its implications for student achievement in high-poverty schools c2008 ap.793-818. aAutumn aTeachers aJournal of Policy Analysis and Management