TY  - BOOK
AU  - Tredgold,A.F.
AU  - Tredgold,Roger
AU  - Soddy,Kenneth
TI  - Tredgold's mental retardation
SN  - 0702002879
AV  - MED RC570 .T73 
PY  - 1970///
CY  - Baltimore
PB  - Williams and Wilkins
KW  - Mental retardation
N1  - First ed., 1908, has title: Mental deficiency (amentia)
ER  -