Montanheiro, Tarcísio José, Francisco de Assis Negri, Valdecir de Assis Janasi, Jorge Kazuo Yamamoto, and Fabiana Pereira Vogado. “ Massive Volcanic Glass: Natural Pozzolan in the West of São Paulo State ”. Geologia USP. Série Científica 11, no. 1 (April 1, 2011): 59–74. Accessed June 26, 2024. https://journals.usp.br/guspsc/article/view/27497.