Columbia subject headings:
Harvard subject headings:
Middle age--Germany--Conduct of life.
Middle age--Germany--Economic conditions.
Middle age--Germany--Social conditions.
Young adults--Germany--Conduct of life.
Young adults--Germany--Economic conditions.
Young adults--Germany--Social conditions.
Princeton subject headings:
Middle age--Germany--Conduct of life.
Middle age--Germany--Economic conditions.
Middle age--Germany--Social conditions.
Young adults--Germany--Conduct of life.
Young adults--Germany--Economic conditions.
Young adults--Germany--Social conditions.