TY  - BOOK
AU  - Penrose,L.S.
TI  - The biology of mental defect
U1  - 136.32 
PY  - 1949///. [Reprinted 1954]
CY  - New York
PB  - Grune & Stratton
KW  - Medical genetics
KW  - People with mental disabilities
KW  - Mental retardation
N1  - Bibliography: p. 241-264. and Index
ER  -