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  1. SGEM 2019. 19th international multidisciplinary scientific geoconference. Vol. 19. Ecology, economics,education and legislation Issue: 5.4 28.6.-7.7.2019, Albena / rec. Valeriy Bondur, Raimonds Ersteins
    Bondur, Valeriy (rec.) Ersteins, Raimonds (rec.)
    SGEM 2019. Ecology, economics,education and legislation 19th 28.6.-7.7.2019 Albena
    1.vyd
    Sofia SGEM world science 2019 . - 420 s.
    ISBN 978-619-408-87-4
    ISSN 1314-2704
    www.sgemworld.at
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