“Economic Valuation for the Conservation of the Huallaga River by the Population of Tingo María, Las Orquídeas – Naranjillo De Leoncio Prado Section”. Revista de Investigación Cientifica Huamachuco 1, no. 1 (December 1, 2024). Accessed December 28, 2024. http://revistas.unca.edu.pe/index.php/rich/article/view/12.