Columbia subject headings:
Harvard subject headings:
Canada--Foreign relations--China.
China--Foreign relations--1976-
China--Foreign relations--Canada.
China--Foreign relations--United States.
United States--Foreign relations--China.
Visits of state--North America.
Zhao, Ziyang--Journeys--Canada.
Zhao, Ziyang--Journeys--United States.
Princeton subject headings:
Canada--Foreign relations--China.
China--Foreign relations--1976-
China--Foreign relations--Canada.
China--Foreign relations--United States.
United States--Foreign relations--China.
Visits of state--North America.
Zhao, Ziyang--Journeys--Canada.
Zhao, Ziyang--Journeys--United States.