Chávez, Luis, and Kurt A Haberyan. “Diatom Assemblages from the Camastro Diatomite, Costa Rica”. Revista de Biología Tropical 44, no. 2B (August 1, 1996): 899–902. Accessed May 18, 2024. https://revistas.ucr.ac.cr/index.php/rbt/article/view/21740.