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 Report on an Analysis of Spindle Whorl from Callao Cave, Peñablanca, Northern Luzon Philippines.
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ISSN 0119-173X. Available at: &lt;<a href="https://journals.upd.edu.ph/index.php/asp/article/view/4997" target="_new">https://journals.upd.edu.ph/index.php/asp/article/view/4997</a>&gt;. Date accessed: 12 aug. 2025.