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Boulder, Colorado Boulder City, Nevada Boulder Hill, Illinois Boulder Junction, Wisconsin Boulder, Quận Linn, Iowa Boulleret Bouderbala Bò AlderneyTài liệu tham khảo
WikiPedia: Boulder Hill, Illinois http://factfinder2.census.gov/faces/tableservices/... http://www.census.gov/geo/www/gazetteer/gazetteer2...