Columbia subject headings:
Harvard subject headings:
Agriculture--Europe--History--19th century.
Agriculture--North America--History--19th century.
Agriculture--Russia--History--19th century.
Peasants--Russia--History--19th century
Princeton subject headings:
Agriculture--Economic aspects--Europe.
Agriculture--Economic aspects--North America.
Agriculture--Economic aspects--Soviet Union.
Agriculture--Europe--History.
Agriculture--North America--History.
Agriculture--Soviet Union--History.