Columbia University
Nasa: Sedac: Urbanization and Human Settlements
[Free Registration/Login Required] A collection of twenty data sets from SEDAC (Socioeconomic Data and Applications Center) that examine urbanization in major metropolitan areas of the United States in the late 20th and the early 21st...
PBS
Pbs: American Experience: Mass Exodus From the Plains
This site is from PBS.org explaining the migration of people out of the plains during the dust bowl. Use this article to learn all about the reasons people left and where they went.