Ordnance Survey ~ 1791 ~ 1991
The Ordnance Survey was begun in 1791 in preparation
for an expected French invasion. The maps of the village of Ham
Street, Kent (7 miles south of the town of Ashford) show the
development of the Survey maps from the beginning to the present. The
maps are dated 1816, 1906, 1959 and 1991. The stamps were issued in
1991 to commemorate the bicentennial of the Survey. While the Survey
was originally for military purposes it now makes map of all kinds.