Smith's book is usually considered to be the beginning of modern economics.
External Links
The Wealth of Nations online (http://www.econlib.org/library/Smith/smWN)
... a total area of 13.1 km² (5.1 mi²). 11.9 km² (4.6 mi²) of it is land and 1.2 km² (0.4 mi²) of it is water. The total area is 8.91% water. ...