Geological Survey of Japan (GSJ), AIST is a public organization to carry out various geological surveys and researches. GSJ has consistently provided geological information, which is essential to build a safe and sustainable society, since its establishment in 1882.

Hara, Hidetoshi. Geology of the Umaji District / H. Hara, T. Ueki, K. Hara. – Tsukuba : Geological survey of Japan, AIST, 2020 - (Quadrangle series, 1:50,000, Kochi (13) ; N 65, NI-53-22-15).Bibliogr. reference of each chapter.