Columbia subject headings:
Duncan, Helen, 1897-1956.
Great Britain.
Jurisprudence--History.
Trials (Witchcraft)--England--History.
Witchcraft--Great Britain--History--19th century.
Witchcraft--History.
Harvard subject headings:
Duncan, Helen, 1895-1956.
Duncan, Helen, 1898-1956.
Mediums--Scotland--Biography.
Trials (Witchcraft)--England--History.
Witchcraft--Great Britain--History--19th century.
Witchcraft--Great Britain--History--20th century.
Princeton subject headings:
Duncan, Helen, 1895-1956.
Great Britain.
Mediums--Great Britain--Biography.
Witchcraft--Great Britain--History--20th century.