Columbia subject headings:
Railroad bridges--Austria--Linz--Design and construction--History.
Railroad bridges--Austria--Linz--History.
Harvard subject headings:
Railroad bridges--Austria--Linz--Design and construction--History.
Railroad bridges--Austria--Linz--History.
Princeton subject headings:
Railroad bridges--Austria--Linz--Design and construction--History.
Railroad bridges--Austria--Linz--History.