Molecular weights of humic acids in podzol and ferrallitic soils of the savannas of French Guyana and their evolution related to soil moisture. Tropical Agriculture, [S. l.], v. 51, n. 2, 1974. Disponível em: https://journals.sta.uwi.edu/ojs/index.php/ta/article/view/3249.. Acesso em: 29 may. 2024.