Columbia subject headings:
Harvard subject headings:
Environmental protection--Austria--History.
Natural history--Austria.
Nature conservation--Austria--History.
Nature conservation--Austria--Pictorial works.
Österreichischer Naturschutzbund--History.
Princeton subject headings:
Environmental protection--Austria--History.
Natural history--Austria.
Nature conservation--Austria--History.
Nature conservation--Austria--Pictorial works.
Österreichischer Naturschutzbund--History.