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KOLEVA, Vanya, KOYNOVA, Teodora, DRAGOEVA, Asya, KOLEV, Nikolay, KULEVA, Ivayla and NATCHEV, Nikolay. Benefits for visitors provided by protected areas in Bulgaria and willingness to become a conservation volunteer. Ecological Questions. Online. 5 December 2023. Vol. 35, no. 2, pp. 1-11. [Accessed 15 July 2024]. DOI 10.12775/EQ.2024.016.