TY  - BOOK
ED  - US. Health, Education and Welfare Dept.
TI  - Duration of limitation of activity due to chronic conditions: United States
U1  - 000SC:614(73) 
PY  - 1960///
CY  - Washington
PB  - Govt Printing Office
KW  - Chronic conditions
N1  - Health Statistics ; no.31
ER  -