Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) YAMAMOTO Genjyu and NAGAMINE Takashi and KITAGAKI Toshiaki and UNNO Tomonori,"Discovery of the manganese nodule in ground water from the Oppu Mine, Aomori Prefecture, Japan",Earth Science (Chikyu Kagaku),03666611,The Association for the Geological Collaboration in Japan,2004,58,6,375-388,https://cir.nii.ac.jp/crid/1390001204265448832,https://doi.org/10.15080/agcjchikyukagaku.58.6_375