Poster of Oil shale mining influence to the environment in EstoniaValgma, Ingo; Väizene, Vivika; Orru, Mall; Vendla, Silja; Ljaš, Julia; Pensa, Margus; Anepaio, Ain; Karu, VeikoInternational oil shale symposium : Tallinn, Estonia, June 10-13, 20132013 / [1] p