Concept
Version 6
Created by Boundless
Congressional Districts
Source
Boundless vets and curates high-quality, openly licensed content from around the Internet. This particular resource used the following sources:
"File:110th US Congress House districts color.svg - Wikipedia, the free encyclopedia."
http://en.wikipedia.org/w/index.php?title=File:110th_US_Congress_House_districts_color.svg&page=1
Wikipedia
Public domain.