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= International Congress of Speleology in Artificial Cavities Hypogea, III. Dobrich. 2019
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Title	Author(s)	ISBN	Year
Proceedings of 3rd International Congress of Speleology in Artificial Cavities Hypogea 2019, Dobrich, Bulgaria, 20-25 May 2019 [книга]	International Congress of Speleology in Artificial Cavities Hypogea, III. Dobrich. 2019	978-619-7526-01-1	2019