TCHERKEZOVA , milia .; STOYANOVA, elimira .; KOTSEV, T. . A CONCEPT OF AN INTEGRATED GEODATABASE FOR SURFACE WATER, SOIL AND GROUNDWATER POLLUTION WITH ARSENIC IN THE UPPER PART OF OGOSTA VALLEY, NORTHWESTERN BULGARIA. European Journal of Geography, [S. l.], v. 10, n. 3, 2019. Disponível em: https://eurogeojournal.eu/index.php/egj/article/view/201. Acesso em: 18 mar. 2025.