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Pioneer 10 Pioneer 11 Pioneer Corporation Pioneer Cabin Tree Pioneer, Ohio Pioneer, Iowa Pioneer Venus Pioneer, Quận Cedar, Iowa Pioneer, Quận Rice, Kansas Pioneer, Quận Graham, KansasTài liệu tham khảo
WikiPedia: Pioneer, Iowa http://factfinder2.census.gov/faces/tableservices/... http://www.census.gov/geo/www/gazetteer/gazetteer2... http://data.iowadatacenter.org/datatables/PlacesAl...