Supplement to: Takeda, Hideo; Maruyama, Shuji; Yamakado, Norio; Inoue, Eiji; Iso, Miyoji; Matsumoto, Sakae; Suzuki, Taisuke; Usami, Takeshi; Tsurusaki, Katsuya; Handa, Keiji; Matsumoto, Eiji; Yuasa, Makoto (1975): Manganese nodules and their prospecting around the Mariana Basin in the Northwestern Pacific. Bulletin of the Geological Society of Japan, 26(11), 1-445, https://www.gsj.jp/en/publications/bull-gsj/geppou26-11.html