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2023. Economic valuation for the conservation of the Huallaga River by the population of Tingo María, Las Orquídeas – Naranjillo de Leoncio Prado section. Huamachuco Scientific Research Journal. 1, 1 (Oct. 2023), 02–22. DOI:https://doi.org/10.61709/huamachuco.v1i1.2.