Columbia subject headings:
Harvard subject headings:
Colombia--Foreign relations--United States.
Colombia--Foreign relations.
Diplomats--Colombia--Correspondence.
Herrán, Tomás, 1843-1904--Correspondence.
Herrán, Tomás, 1843-1904.
Panama Canal (Panama)--History.
Panama--History--Revolution, 1903--Sources.
Statesmen--Colombia--Correspondence.
United States--Foreign relations--Colombia.
Princeton subject headings:
Canal Zone--History--Sources.
Colombia--Foreign relations--United States.
Herrán, Tomás, 1843-1904--Correspondence.
United States--Foreign relations--Colombia.