Columbia subject headings:
Architects--Germany--Biography.
Architecture--Germany--Oldenburg (Landkreis)--History--19th century.
Hillerns, Hero Diedrich, 1807-1885.
Harvard subject headings:
Architects--Germany--Biography
Architecture, Modern--19th century--Germany--Oldenburg (Landkreis)
Architecture--Germany--Oldenburg (Landkreis)--History--19th century.
Hillerns, Hero Diedrich, 1807-1885.
Princeton subject headings:
Architects--Germany--Biography.
Architecture, Modern--19th century--Germany (West)--Oldenburg (Landkreis).
Hillerns, Hero Diedrich, 1807-1885.