00760nam a2200217Ia 4500001000700000003000500007005001700012008004100029035002000070040001300090100003300103245008900136260004500225300002400270490006000294500004800354504002800402650004000430650004000470650003200510131864BIBL20160527192049.0840910s1939    pr a     b    000 0 eng d  a(OCoLC)11135199  aOUNcOUN1 aPorrata, Oscar Emilio2Local10aRetardation in the elementary urban schools of Puerto Ricocby Oscar Emilio Porrata.  aRio Piedras, P.R.bThe Universityc1939.  a63 p.bill.c24 cm.0 aUniversity of Puerto Rico bulletinvser. X, no.12Local  aThesis (M.A.)--University of Chicago, 1934.  aBibliography: p. 62-63. 0aGrading and marking Students2Local 0aPublic schoolszPuerto Rico.2Local 0aHandicapped children2Local