C Thiemann, F Theis, D Grady, R Brune, D Brockmann | PlosOne
November 18, 2010
Territorial subdivisions and geographic borders are essential for understanding phenomena in sociology, political science, history, and economics. They influence the interregional flow of information and cross-border trade and affect the diffusion of innovation and technology.
Imagery showing effective subdivisions and borders in the United States based on bank note distributions