Columbia subject headings:
Free love--United States--History--19th century.
Middle class--United States--History--19th century.
Radicalism--United States--History--19th century.
Harvard subject headings:
Free love--United States--History--19th century
Middle class--United States--History--19th century.
Radicalism--United States--History--19th century.
Princeton subject headings:
Free love--United States--History--19th century.
Middle class--United States--History--19th century.
Radicalism--United States--History--19th century.