KHALED, Benrachedi. STUDY OF ADSORPTION OF METHYLENE BLUE ONTO COFFEE GROUND. Journal of Agriculture and Environment, [S.l.], n. 1 (2), mar. 2017. ISSN 2564-890X. Available at: <http://jae.cifra.science/article/view/46>. Date accessed: 24 june 2019. doi: http://dx.doi.org/10.23649/jae.2017.1.2.4.