Columbia subject headings:
Harper, Robert Goodloe, 1765-1825.
Slavery--United States--History--18th century.
Slavery--United States--History--19th century.
Harvard subject headings:
Harper, Robert Goodloe, 1765-1825--Views on slavery.
Slavery--United States--History--18th century
Slavery--United States--History--19th century
Princeton subject headings:
Harper, Robert Goodloe, 1765-1825.
Slavery--United States--History--18th century.
Slavery--United States--History--19th century.