Castelán Vega, R. del C. et al. 2017. Erosion and loss of nutrients in different farming systems of a watershed in the periurban area of the city of Puebla, Mexico. REVISTA TERRA LATINOAMERICANA. 35, 3 (Jul. 2017), 229–235. DOI:https://doi.org/10.28940/terra.v35i3.134.