This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Maryland US Congressional District since .tif en Boundaries for Maryland st United States Federal Congressional District Source GIS shapefile data created by the United States Department of the Interior as part of the Million Scale geospatial data project Retrieved from gov html openChapters chpbound GIS congressional districts