1 if woman worked in 1975
wife's hours of work
# of children younger than 6
# of children between 6 and 18
wife's age
wife's education attainment
wife's wage
husband's hours worked in 1975
husband's age
husband's educational attainment
husband's wage
family income
wife's mother's educational attainment
wife's father's educational attainment
1 if live in large city