Columbia subject headings:
Harvard subject headings:
Blut und Boden (The German phrase)
Conservation of natural resources--Germany--History--Congresses.
Ecology--Germany--History--20th century--Congresses.
Environmental policy--Germany--History--20th century--Congresses.
Environmental policy--Germany--History--20th century.
Environmental protection--Germany--History--20th century.
National socialism.
Nature conservation--Germany--History--20th century.
Nature conservation--Law and legislation--Germany
Princeton subject headings:
Blut und Boden (The German phrase)--Congresses.
Conservation of natural resources--Germany--History--Congresses.
Ecology--Germany--History--20th century--Congresses.
Environmental policy--Germany--History--20th century--Congresses.
National socialism--Influence--Congresses.