Columbia subject headings:
Delhi (India : Union Territory)--Boundaries.
Delhi (India : Union Territory)--Politics and government.
Sultans--India--Delhi (Union Territory)
Harvard subject headings:
Delhi (Sultanate)--History.
India--Boundaries.
Princeton subject headings:
Delhi (India : Union Territory)--Boundaries.
Delhi (India : Union Territory)--Frontier troubles.
Delhi (India : Union Territory)--Politics and government.
Sultans--India--Delhi (Union Territory).