Columbia subject headings:
Clayton-Bulwer Treaty
Hay-Bunau-Varilla Treaty
Hay-Pauncefote Treaty
Panama Canal (Panama)
Harvard subject headings:
Great Britain. Treaties, etc. 1850 April 19.
Great Britain. Treaties, etc. 1901 November 18.
Panama Canal (Panama)
Panama. Treaties, etc. 1903 November 18.
Treaties.
Princeton subject headings:
Great Britain.
Great Britain. Treaties, etc. 1901 November 18.
Panama Canal (Panama)
Panama. Treaties, etc. 1903 November 18.