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Niagara Falls, Ontario Niagara Falls, New York Niagara (thị trấn), Wisconsin Niagara, Wisconsin Niagara Niagara, Quận Grand Forks, Bắc Dakota Nigga Nagasaki Niigata (thành phố) NiigataTài liệu tham khảo
WikiPedia: Niagara_Falls,_New_York http://www.niagarafallsusa.org/ https://www.census.gov/popest/data/cities/totals/2... https://www.census.gov/programs-surveys/popest/dat... https://www2.census.gov/geo/docs/maps-data/data/ga... https://web.archive.org/web/20140522161634/http://...