TY  - BOOK
AU  - Porrata,Oscar Emilio
TI  - Retardation in the elementary urban schools of Puerto Rico
T2  - University of Puerto Rico bulletin
PY  - 1939///
CY  - Rio Piedras, P.R.
PB  - The University
KW  - Grading and marking Students
KW  - Local
KW  - Public schools
KW  - Puerto Rico
KW  - Handicapped children
N1  - Thesis (M.A.)--University of Chicago, 1934; Bibliography: p. 62-63
ER  -