Columbia subject headings:
Unitarianism--United States--History--19th century--Congresses.
United States--Church history--19th century--Congresses.
Harvard subject headings:
Unitarianism--United States--History--19th century--Congresses.
United States--Church history--19th century--Congresses.
Princeton subject headings:
Unitarianism--United States--History--19th century--Congresses.
United States--Church history--19th century--Congresses.