TY  - BOOK
AU  - Duncan, Otis Dudley.
TI  - Socioeconomic background and achievement
T2  - Studies in population
SN  - MBS3366
U1  - 305.50973 
PY  - 1972///
CY  - New York
PB  - Seminar Press
KW  - Social classes-Research--United States
ER  -