Supplement to: Fyfe, William S; Kronberg, B I; Peirce, M; Leppard, G G (1980): Ferromanganese Nodules from Lake Ontario (Bay of Quinte): Minor Element Geochemistry. Journal of Great Lakes Research, 6(3), 203-209, https://doi.org/10.1016/S0380-1330(80)72101-9