Columbia subject headings:
Harvard subject headings:
Agriculture--Taxation--Europe--History--Congresses.
Farm tenancy--Economic aspects--Europe--History--Congresses.
Sharecropping--Europe--History--Congresses.
Princeton subject headings:
Agriculture--Economic aspects--Europe--History--Congresses.
Farm income--Europe--History--Congresses.
Farm tenancy--Economic aspects--Europe--History--Congresses.
Sharecropping--Europe--History--Congresses.