Columbia subject headings:
People with disabilities--Legal status, laws, etc.--Pennsylvania--History.
People with disabilities--Legal status, laws, etc.--United States--History.
People with disabilities--Pennsylvania--History.
People with disabilities--United States--History.
Sociological jurisprudence.
Harvard subject headings:
People with disabilities--Legal status, laws, etc.--Pennsylvania--History.
People with disabilities--Legal status, laws, etc.--United States--History.
People with disabilities--Pennsylvania--History.
People with disabilities--United States--History.
Sociological jurisprudence.
Princeton subject headings:
People with disabilities--Legal status, laws, etc.--Pennsylvania--History.
People with disabilities--Legal status, laws, etc.--United States--History.
People with disabilities--Pennsylvania--History.
People with disabilities--United States--History.
Sociological jurisprudence.