Columbia subject headings:
Diplomats--Mexico--Correspondence.
Diplomats--United States--Correspondence.
Mexico--Foreign relations--1861-1867.
Mexico--Foreign relations--United States.
Romero, Matías, 1837-1898--Correspondence.
United States--Foreign relations--Mexico.
Harvard subject headings:
Diplomats--Mexico--Correspondence.
Diplomats--United States--Correspondence.
Mexico--Foreign relations--1861-1867.
Mexico--Foreign relations--United States.
Romero, Matías, 1837-1898--Correspondence.
United States--Foreign relations--Mexico.
Princeton subject headings:
Diplomats--Mexico--Correspondence.
Diplomats--United States--Correspondence.
Mexico--Foreign relations--1861-1867.
Mexico--Foreign relations--United States.
Romero, Matías, 1837-1898--Correspondence.
United States--Foreign relations--Mexico.