Columbia subject headings:
Harvard subject headings:
Austria--Population policy--History--20th century.
Austria--Population--History--20th century.
Demography--Austria--History--20th century.
Demography--Germany--History--20th century.
Germany--Population policy--History--20th century.
Germany--Population--History--20th century.
Population research--Austria--History--20th century.
Population research--Germany--History--20th century.
Princeton subject headings:
Demography--Austria--History--20th century.
Demography--Germany--History--20th century.
Population research--Austria--History--20th century.
Population research--Germany--History--20th century.