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Springfield Springfield, Massachusetts Springfield, Illinois Springfield, Oregon Springfield, Missouri Springfield, Ohio Springfield, Minnesota Springfield, Quận Jackson, Wisconsin Springfield, Quận Marquette, Wisconsin Springfield, Quận St. Croix, WisconsinTài liệu tham khảo
WikiPedia: Springfield, Massachusetts http://www.cardcow.com/12517/city-progress-new-lib... http://www.cardcow.com/129088/city-progress-winche... http://www.ebooksread.com/authors-eng/george-storr... http://www.springfieldcityhall.com/COS/ http://factfinder2.census.gov/faces/tableservices/... http://www.census.gov/popest/metro/tables/2009/CBS... http://www.archive.org/stream/picturesquesprin00gr... http://www.archive.org/stream/picturesquesprin00gr... http://www.archive.org/stream/progressivesprin00gr... //tools.wmflabs.org/geohack/geohack.php?language=v...