“Determination of the Amount of Carbon and the Isotopic Ratio 14C: 12C of a Ferrallitic Horizon under Isovolumetric Weathering in the Humid Tropical Region of Bahia (Brazil)”. Tropical Agriculture 51, no. 2 (April 30, 1974). Accessed January 20, 2025. https://journals.sta.uwi.edu/ojs/index.php/ta/article/view/3248.