Data:
U.S. Department of Agriculture, National Agricultural Statistics Service
Farm Numbers, 1975-80;                         
Farms and Land in Farms, Final Estimates by States, 1979-1987;         
Farms and Land in Farms, Final Estimates, 1988-1992;             
Farms and Land in Farms, Final Estimates, 1993-1997;             
Farm Numbers and Land in Farms, Final Estimates, 1998-2002; and         
Farms, Land in Farms, and Livestock Operations, annual             

3D Illustration/animation by Mark Pinkston