Columbia subject headings:
Antislavery movements--Pennsylvania--History--19th century.
Underground Railroad--Pennsylvania.
Harvard subject headings:
Antislavery movements--Pennsylvania--History--19th century.
Underground Railroad--Pennsylvania.
Princeton subject headings:
Antislavery movements--Pennsylvania--History--19th century.
Fugitive slaves--Pennsylvania--History--19th century.
Pennsylvania--History--19th century.
Underground Railroad--Pennsylvania.