Columbia subject headings:
Harvard subject headings:
Bicycles--Germany--History--20th century.
Canoes and canoeing--Germany--History--20th century.
Cyclists--Germany--Biography.
Nissen, Gregers, 1867-1942.
Pioneers--Germany--Biography.
Travel writers--Germany--Biography.
Princeton subject headings:
Bicycles--Germany--History--20th century.
Canoes and canoeing--Germany--History--20th century.
Cyclists--Germany--Biography.
Nissen, Gregers, 1867-1942.
Pioneers--Germany--Biography.
Travel writers--Germany--Biography.