Columbia subject headings:
Harvard subject headings:
Lower Austria (Austria)--Economic conditions--20th century.
Lower Austria (Austria)--Politics and government--20th century.
Lower Austria (Austria)--Social life and customs--20th century.
Princeton subject headings:
Lower Austria (Austria)--Economic conditions--20th century.
Lower Austria (Austria)--Politics and government--20th century.
Lower Austria (Austria)--Social life and customs--20th century.