Columbia subject headings:
Bridges--Design and construction--History--19th century.
Gerber, Heinrich, 1832-1912.
Iron and steel bridges--Germany--Bavaria--History--19th century.
Railroad bridges--Germany--Bavaria--History--19th century.
Harvard subject headings:
Bridge construction industry--Germany--Bavaria--History.
Bridges--Germany--Bavaria--Design and construction--History.
Gerber, Heinrich, 1832-1912.
Iron and steel bridges--Germany--Bavaria--Design and construction--History.
Princeton subject headings:
Bridge construction industry--Germany--Bavaria--History.
Bridges--Germany--Bavaria--Design and construction--History.
Gerber, Heinrich, 1832-1912.
Iron and steel bridges--Germany--Bavaria--Design and construction--History.