Title: XIV kolokvium "Fizikata v opazvaneto na choveka i okolnata mu sreda" na tema Vlii︠a︡nie na antropogennata deĭnost vŭrkhu sŭstoi︠a︡nieto na pochvite v Bŭlgarii︠a︡
Subjects: Soil conservation, Nature, Soil ecology, Effect of human beings on, Soil degradation, Congresses, Soil erosion, Soils
Places: Bulgaria