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Barbosa, R.D., de Lima, A.F.L., Simões, E.L., Brito Filho, E.G. de, Campos, M.C.C., Cunha, J.M. da, Mantovanelli, B.C., Silva, D.M.P. and Souza, F.G. de 2019. Spatial variation of chemical attributes in archaeological dark earth under cocoa cultivation in Western Amazon. Bioscience Journal. 35, 1 (Feb. 2019), 27–41. DOI:https://doi.org/10.14393/BJ-v35n1a2019-37137.