Columbia subject headings:
Asia, Central--Foreign relations--Sources.
Asia, Central--Foreign relations.
Asia, Central--History--19th century--Sources.
Asia, Central--History--19th century.
Harvard subject headings:
Asia, Central--Foreign relations--Sources.
Asia, Central--Foreign relations.
Asia, Central--History--19th century--Sources.
Asia, Central--History--19th century.
Princeton subject headings:
Asia, Central--Foreign relations--Sources.
Asia, Central--Foreign relations.
Asia, Central--History--19th century--Sources.
Asia, Central--History--19th century.