HERRERA FLORES, Jorge.
 Paleontological Research in the Valley of Puebla During the 20th Century.
<strong>CIENCIA ergo-sum</strong>, [S.l.], v. 24, n. 3, p. 259-266, oct. 2017.
ISSN 2395-8782.
Available at: &lt;<a href="https://cienciaergosum.uaemex.mx/article/view/7382" target="_new">https://cienciaergosum.uaemex.mx/article/view/7382</a>&gt;. Date accessed: 18 aug. 2026.
doi: <a href="https://doi.org/10.30878/ces.v24n3a8">https://doi.org/10.30878/ces.v24n3a8</a>.