18 million Dutch.
23 million bicycles.
11,300 miles of dikes, dams, and secondary barriers.
336 million Americans.
100 million bikes.
600,000 miles of dikes, dams, and secondary barriers.
18 million Dutch.
23 million bicycles.
11,300 miles of dikes, dams, and secondary barriers.
336 million Americans.
100 million bikes.
600,000 miles of dikes, dams, and secondary barriers.