Columbia subject headings:
Agriculture--Economic aspects--Europe, Central--Congresses.
Pasture ecology--Europe, Central--Congresses.
Pastures--Europe, Central--History--To 1500--Congresses.
Harvard subject headings:
Agriculture--Economic aspects--Europe, Central--Congresses.
Pasture ecology--Europe, Central--Congresses.
Pastures--Europe, Central--History--Congresses.
Princeton subject headings:
Agriculture--Economic aspects--Europe, Central--Congresses.
Pasture ecology--Europe, Central--Congresses.
Pastures--Europe, Central--History--Congresses.