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2. Landslide map database, National Research Institute of Earth Science and Disaster Prevention, http://lsweb1.ess.bosai.go.jp/jisuberi/jisuberi_mini_eng/jisuberi_top.html
3. Yanagisawa Y, Kobayashi I, Takeuchi K, Tateishi M, Chihara K, Kato H (1986) Geology of the Ojiya District, Quadrangle Series, Scale 1:50,000, Niigata (7), No. 50, Geological Survey of Japan