Authors: 1) All GIS data presented in this project was originally collected and published by the United States Department of the Interior. 2) US district GIS shapefile data created in association with the UCLA by Jeffrey B. Lewis, Brandon DeVine, Lincoln Pitcher, and Kenneth C. Martis. (2013) Digital Boundary Definitions of United States Congressional Districts, 1789-2012. 3) Data was rendered using ArcGIS® software by Esri. 4) File developed for use on Wikipedia and elsewhere by
7partparadigm.