Columbia subject headings:
Harvard subject headings:
Agriculture and state--Spain--History--18th century--Congresses.
Agriculture--Economic aspects--Spain--History--18th century--Congresses.
Agriculture--Spain--History--18th century--Congresses.
Spain--Rural conditions--Congresses.
Princeton subject headings:
Agriculture and state--Spain--History--18th century--Congresses.
Agriculture--Economic aspects--Spain--History--18th century--Congresses.
Agriculture--Spain--History--18th century--Congresses.
Spain--Rural conditions--Congresses.