Columbia subject headings:
Clayton-Bulwer Treaty
Great Britain--Foreign relations--United States.
Panama Canal (Panama)
United States--Foreign relations--Great Britain.
Harvard subject headings:
Great Britain--Foreign relations--United States.
Great Britain. Treaties, etc. 1850 Apr. 19.
Great Britain. Treaties, etc. 1850 April 19.
Panama Canal (Panama)
United States--Foreign relations--Great Britain.
Princeton subject headings: