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Patarroyo, Pedro (2009). "Amonitas de un nivel de alta energía del Barremiano inferior en la Formación Paja de los sectores de Villa de Leyva (Boyacá) y Vélez (Santander)". Boletín de Geología31: 15–21. Retrieved on 2019-03-12.
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Pedro Patarroyo, 2009
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