Gunko A., Kondratyeva S. Stepkin V. Artificial caves in chalk outcrops in the Don basin. 2017 г.

Gunko A., Kondratyeva S. Stepkin V. Artificial caves in chalk outcrops in the Don basin // Proceedings of International Congress of Speleology in Artificial Caves Hypogea 2017, Cappadocia, Turkey, 6/10 March 2017. – Cappadocia, 2017. – р. 554. P. 461-467.

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