Columbia subject headings:
Agriculture--Social aspects--Congresses.
Elite (Social sciences)--Congresses.
Sociology, Rural--History--Congresses.
Harvard subject headings:
Agriculture--Social aspects--Congresses.
Elite (Social sciences)--Congresses.
Sociology, Rural--History--Congresses.
Princeton subject headings:
Agriculture--Social aspects--Congresses.
Elite (Social sciences)--Congresses.
Sociology, Rural--History--Congresses.