(Table 1, page 287) Chemical composition of ocean manganese nodules from the Pacific and Indian oceans using neutral activation analysis and atomic absorption spectroscopy - David Z Piper; M E Williamson (PANGAEA, 1977)
In supplement to: Piper, DZ; Williamson, ME (1977): Composition of Pacific Ocean ferromanganese nodules. Marine Geology, 23(4), 285-303, https://doi.org/10.1016/0025-3227(77)90036-6