Columbia subject headings:
Age and employment--Iowa--Public opinion--Longitudinal studies.
Older men--Iowa--Attitudes--Longitudinal studies.
Public opinion--Iowa--Longitudinal studies.
Retirement--Iowa--Public opinion--Longitudinal studies.
Rural elderly--Iowa--Attitudes--Longitudinal studies.
Harvard subject headings:
Age and employment--Iowa--Public opinion--Longitudinal studies.
Older men--Iowa--Attitudes--Longitudinal studies.
Public opinion--Iowa--Longitudinal studies.
Retirement--Iowa--Public opinion--Longitudinal studies.
Rural elderly--Iowa--Attitudes--Longitudinal studies.
Princeton subject headings:
Age and employment--Iowa--Public opinion--Longitudinal studies.
Older men--Iowa--Attitudes--Longitudinal studies.
Public opinion--Iowa--Longitudinal studies.
Retirement--Iowa--Public opinion--Longitudinal studies.
Rural older people--Iowa--Attitudes--Longitudinal studies.