Columbia subject headings:
Harvard subject headings:
Canals--India--Punjab.
Great Britain--Colonies--India.
Irrigation--India--Punjab.
Punjab (India)--Economic conditions.
Princeton subject headings:
Canals--India--Punjab.
Canals--Pakistan--Punjab.
Great Britain--Colonies--India.
Irrigation--India--Punjab.
Irrigation--Pakistan--Punjab.
Punjab--Economic conditions.