Columbia subject headings:
Northwest, Old--History--1775-1865--Congresses.
United States. Ordinance of 1787--Congresses.
Harvard subject headings:
Conference papers and proceedings.
Northwest, Old--History--1775-1865--Congresses.
United States. Ordinance of 1787--Congresses.
Princeton subject headings:
Northwest, Old--History--1775-1865--Congresses.
United States. Ordinance of 1787--Congresses.