(Table 1, page 94) Analytical determination of Thorium 230 over Thorium 232 ratio for Mn deposits from the Atlantic Ocean - Moore, Willard S (In supplement to: Moore, WS (1973): Accumulation rates of manganese crusts on rocks exposed on the sea floor. In: Phase I Report - Inter-University Program of Research on Ferromanganese Deposits of the Ocean Floor. Seabed Assessment Program, IDOE, NSF, Washington D.C., USA, 93-96, https://store.pangaea.de/Projects/NOAA-MMS/Moore2_1973.pdf, 1973)