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Valim, F.A., Orioli, M.A., Okawa, C.M.P., Ildefonso, J.S. and Gutierrez, N.H.M. 2015. Visual diagnosis of the drainage systemand erosion where the park “Alfredo Werner Nyffeler” located in the city of Maringa-PR finishes. Revista Eletrônica em Gestão, Educação e Tecnologia Ambiental. 19, (Dec. 2015), 30–38. DOI:https://doi.org/10.5902/2236117020557.