Columbia subject headings:
Louisiana--History--To 1803.
Mississippi River--Commerce.
New Orleans (La.)--Commerce.
Spain--Foreign relations--United States.
United States--Foreign relations--Spain.
Harvard subject headings:
Louisiana--History--To 1803
Mississippi River--Commerce.
New Orleans (La.)--Commerce.
Spain--Foreign relations--United States.
United States--Foreign relations--Spain.
Princeton subject headings:
Louisiana--History--To 1803.
Mississippi River--Commerce.
New Orleans (La.)--Commerce.
Spain--Foreign relations--United States.
United States--Foreign relations--Spain.