Columbia subject headings:
Harvard subject headings:
Agriculture--Economic aspects
Regional economics--History--19th century.
Space in economics.
Thünen, Johann Heinrich von, 1783-1850. Isolierte Staat in Beziehung auf Landwirtschaft und Nationalökonomie.
Princeton subject headings:
Agriculture--Economic aspects.
Regional economics.
Rent (Economic theory)
Thünen, Johann Heinrich von, 1783-1850.