00893nam a2200253Ia 4500 131864 BIBL 20160527192049.0 840910s1939 pr a b 000 0 eng d (OCoLC)11135199 OUN OUN PUXA LB3063 .P6 1939x Porrata, Oscar Emilio Local 152674 Retardation in the elementary urban schools of Puerto Rico by Oscar Emilio Porrata. Rio Piedras, P.R. The University 1939. 63 p. ill. 24 cm. University of Puerto Rico bulletin ser. X, no.1 Local 183292 Thesis (M.A.)--University of Chicago, 1934. Bibliography: p. 62-63. Grading and marking Students Local 104940 Public schools Puerto Rico. Local 154937 Handicapped children Local 107927 111356 111356 0 0 0 371_900000000000000_P838R 0 ci 164670 10 10 B 2016-05-27 199934 0 371.9 P838r 80000001567398 2016-05-27 00:00:00 r:131864 z:NCC:D 6