Columbia subject headings:
Agriculture and state--India--Ganges-Yamuna Doab--History--19th century.
Agriculture--India--Ganges-Yamuna Doab--History--19th century.
British--India--Ganges-Yamuna Doab--History--19th century.
Human ecology--India--Ganges-Yamuna Doab--History--19th century.
Harvard subject headings:
Agriculture and state--India--Ganges-Yamuna Doab--History--19th century.
Agriculture--Economic aspects--India--Ganges-Yamuna Doab--History--19th century.
Agriculture--Environmental aspects--India--Ganges-Yamuna Doab--History--19th century.
Princeton subject headings: