Gregers Nissen: Von Hamburg auf dem Rade nordwärts [From Hamburg on a Bicycle Northbound], ed. by theAltonaer Bicycle-Club von 1869/80, Reprint 2017 (first publication 1897), 47 pages.
Wonderful little cycling guide from 1897. The author Gregers Nissen describes two tours from Hamburg, one to Sylt and the the other to Denmark and Copenhagen.
