Вие търсихте за: автор = International Congress of Speleology in Artificial Cavities Hypogea, III. Dobrich. 2019
Proceedings of 3rd International Congress of Speleology in Artificial Cavities Hypogea 2019, Dobrich, Bulgaria, 20-25 May 2019 / Ed. Alexey Zhalov et al . - [Sofia] : Bulgarian Caving Society, 2019. - 203 p. : Ill. ; 30 cm. Други ред.: Vanyo Gyorev, Peter Delchev. Съдържа: Библиогр. след отд. докл. - Рез. на англ. ез. ISBN: 978-619-7526-01-1 УДК 551.44(063)+904:72(063)
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