TY  - BOOK
AU  - Penrose, Lionel S
TI  - Biology Of Mental Defect
U1  - 616.8 
PY  - 1947///
CY  - London
PB  - Sidgwick & Jackson
KW  - General Stack
KW  - Technology
KW  - Medicine & healthDiseases
KW  - Zoology
ER  -