Map shapefile from the Maryland Department of Planning: <a rel="nofollow" class="external free" href="https://planning.maryland.gov/Redistricting/Pages/historical.aspx">https://planning.maryland.gov/Redistricting/Pages/historical.aspx</a>
Election results from the Maryland State Board of Elections: <a rel="nofollow" class="external free" href="https://elections.maryland.gov/elections/2006/results/general/office_Representative_in_Congress.html">https://elections.maryland.gov/elections/2006/results/general/office_Representative_in_Congress.html</a>
<a href="//commons.wikimedia.org/w/index.php?title=User:Y2hyaXM&amp;action=edit&amp;redlink=1" class="new" title="User:Y2hyaXM (page does not exist)">Y2hyaXM</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>