Columbia subject headings:
Harvard subject headings:
Agriculture--Germany, Southern--History--Congresses.
Germany, Southern--Rural conditions--Congresses.
Land use, Rural--Germany, Southern--History--Congresses.
Land use--Environmental aspects--Germany, Southern--History--Congresses.
Land use--Germany, Southern--History--Congresses.
Landscape changes--Germany, Southern--History--Congresses.
Princeton subject headings:
Agriculture--Germany, Southern--History--Congresses.
Germany, Southern--Rural conditions--Congresses.
Land use, Rural--Germany, Southern--History--Congresses.
Land use--Environmental aspects--Germany, Southern--History--Congresses.
Land use--Germany, Southern--History--Congresses.
Landscape changes--Germany, Southern--History--Congresses.