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3. 遠藤 毅・川島眞一・川合将文, 2001, 東京下町低地における“ゼロメートル地帯”展開と沈静化の歴史.応用地質, 42, 74–87. [Endo, T., Kawashima, S. and Kawai, M., 2001, Historical review of development of land subsidence and its cease in Shitamachi Lowland, Tokyo. J. Japan Soc. Eng. Geol., 42, 74–87.]
4. 藤岡町史編纂委員会, 2002, 藤岡町史資料編渡良瀬遊水地の自然.栃木県下都賀郡藤岡町, 472p. [Editorial Committee of the History of Fujioka Town, 2002, History of Fujioka Town, Nature of Wataraseyusuichi Reservoir. Fujioka Town, Shimotsuga County, Tochigi Prefecture, 472p.] English translation from the original written in Japanese.
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