Columbia subject headings:
Harvard subject headings:
Mariazell (Austria)--History.
Mariazellerbahn--History.
Mountain railroads--Austria--Lower Austria--History.
Narrow gauge railroads--Austria--Lower Austria--History.
Railroads--Austria--Mariazell--History.
Princeton subject headings:
Mariazell (Austria)--History.
Mountain railroads--Austria--Lower Austria--History.
Narrow gauge railroads--Austria--Lower Austria--History.
Railroads--Austria--Mariazell--History.