Columbia subject headings:
Harvard subject headings:
Bicycles--History
Drais, Karl Friedrich Christian Ludwig, Freiherr von Sauerbronn, 1785-1851
Inventions--History
Inventors--Germany--Biography.
Princeton subject headings:
Bicycles--History.
Drais, Karl Friedrich Christian Ludwig, Freiherr von Sauerbronn, 1785-1851.
Inventions--History.
Inventors--Germany--Biography.