Historic districts in the United States

1990, United States Census Bureau, (2011-02-12), http://www.census.gov/geo/www/gazetteer/gazette.html 2011年4月23日閲覧。  ^ “Will Gerrymandered Districts Stem

23, 2010閲覧。 ^ “Return of the Whole Number of Persons within the Several Districts of the United States” (PDF). United States Census Bureau. p. 31 (PDF

Percival. Preliminary Results as Contained in the Eleventh Census Bulletins: Volume III - 51 to 75, p. 97. United States Census Bureau, 1890. Accessed October

states and counties of the United States: 1790 to 1990 : from the twenty-one decennial censuses. United States Department of Commerce, Bureau of the Census

Congressional Districts” (PDF). Massachusetts Secretary of the Commonwealth. October 18, 2009閲覧。 ^ “Geographic Boundaries of United States Courts of Appeals