TY  - BOOK
AU  - Clark Robert
AU  -  Krepts Juanita
TI  - Sex, age and work :  The changing composition of th   
U1  - X:991.73.N7, L5 
PY  - 1975///
CY  - London
PB  - John Hopkins University Press U. K.     
KW  - Labour Market Economics-United States
ER  -