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On March 28, 2005, Nitta, along with the towns of Ojima and Yabuzukahon (all from Nitta District), was merged into the expanded city of Ōta.
References
"県内の市町村合併の動き(広域市町村圏別)" [List of municipal mergers within the prefecture (divided by region)] (PDF) (in Japanese). Gunma Prefecture. 31 January 2011. Retrieved 20 June 2016.
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