Columbia subject headings:
Duleep Singh, Maharajah, 1838-1893.
Panjabis (South Asian people)--Biography.
Punjab (India)--History.
Punjab (India)--Kings and rulers--Biography.
Secret service--Great Britain--History--19th century.
Harvard subject headings:
Duleep Singh, Maharajah, 1838-1893.
Panjabis (South Asian people)--Biography.
Punjab (India)--History.
Punjab (India)--Kings and rulers--Biography.
Secret service--Great Britain--History--19th century.
Sikhs--Kings and rulers--Biography
Princeton subject headings:
Duleep Singh, Maharaja 1838-1893.
Panjabis (South Asian people)
Punjab (India)--History.
Secret service--Great Britain--History--19th century.