Columbia subject headings:
Cologne (Archdiocese) 1836-1838.
Droste zu Vischering, Clemens August, Freiherr, 1773-1845.
Harvard subject headings:
Cologne (Archdiocese) 1836-1838.
Droste zu Vischering, Clemens August, Freiherr, 1773-1845
Princeton subject headings: