“EL GENERO AMPHIGRAPTUS LAPWORTH (GRAPTOLITHINA) EN EL ORDOVICICO ARGENTINO”, AMGH, vol. 16, no. 1-2, pp. 1–8, Sep. 2013, Accessed: Nov. 22, 2025. [Online]. Available: https://ameghiniana.org.ar/index.php/ameghiniana/article/view/1576