Columbia subject headings:
Corwin, Thomas, 1794-1865.
Mexico--Foreign relations--United States.
United States--Foreign relations--1861-1865.
United States--Foreign relations--Mexico.
Harvard subject headings:
Corwin, Thomas, 1794-1865
Mexico--Foreign relations--United States.
United States--Foreign relations--1861-1865.
United States--Foreign relations--Mexico.
Princeton subject headings:
Corwin, Thomas, 1794-1865.
Mexico--Foreign relations--1861-1867.
Mexico--Foreign relations--United States.
United States--Foreign relations--Mexico.