Columbia subject headings:
Etzel, Carl von, 1812-1865--Exhibitions.
Railroad engineers--Germany--Württemberg--Biography--Exhibitions.
Railroads--Germany--Württemberg--History--19th century--Exhibitions.
Harvard subject headings:
Etzel, Carl von, 1812-1865--Exhibitions.
Railroad engineers--Germany--Württemberg--Biography--Exhibitions.
Railroads--Germany--Württemberg--History--19th century--Exhibitions.
Princeton subject headings:
Etzel, Carl von, 1812-1865--Exhibitions.
Railroad engineers--Germany--Württemberg--Biography--Exhibitions.
Railroads--Germany--Württemberg--History--19th century--Exhibitions.