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 The Peñablanca Flake Tools: An Unchanging Technology?.
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ISSN 0119-173X. Available at: &lt;<a href="https://journals.upd.edu.ph/index.php/asp/article/view/4420" target="_new">https://journals.upd.edu.ph/index.php/asp/article/view/4420</a>&gt;. Date accessed: 06 aug. 2025.