McClung de Tapia, Emily, Elizabeth Solleiro-Rebolledo, Jorge Gama-Castro, José Luis Villalpando, and Sergey Sedov. 2018. “Paleosols in the Teotihuacan Valley, Mexico: Evidence for Paleoenvironment and Human Impact”. Revista Mexicana De Ciencias Geológicas 20 (3):270-82. https://rmcg.unam.mx/index.php/rmcg/article/view/926.