Velasco-Hernández, M. and Lucero-Arellano, M.R. 2019. SHORT NOTE - New locality of the Matzitzi Forniation in the Calapa river, in the boundary area between Oaxaca and Puebla states, Mexico. Revista Mexicana de Ciencias Geológicas. 13, 1 (Jan. 2019), 123–127.