Supplement to: Sorem, Ronald K; Fewkes, Ronald H (1980): Distribution of Todorokite and Birnessite in manganese nodules from the "Horn Region", Eastern Pacific Ocean. in: Varentsov, I. M., Grasselly, G. (Eds.), Geology and Geochemistry of Manganese, E. Schweizerbart'sche Verlagsbuchhandlung, Stuttgart, Germany, 1, 201-229, https://store.pangaea.de/Projects/NOAA-MMS/Sorem_1980.pdf