Bosak, P., Lutsyk, A., & Korol, K. (2019). ENVIRONMENTAL CHARACTERISTICS OF THE SLAVKA AND THE OPIR RIVERS ON THE TERITORY OF SLAVSK ( LVIV REGION). Bulletin of Lviv State University of Life Safety, 20, 80-84. https://doi.org/https://doi.org/10.32447/20784643.20.2019.11