P. Baron, Tr. Daaliev, A. Jalov. «Caves and speleology in Bulgaria» Pensoft pubhshlng, Bulgarian federation of speleology, National museum of natural history, 2006. 507 p.
For citations:
, Dublyansky V.N. P. Baron, Tr. Daaliev, A. Jalov. «Caves and speleology in Bulgaria» Pensoft pubhshlng, Bulgarian federation of speleology, National museum of natural history, 2006. 507 p. Proceedings of the Russian Geographical Society. 2009;141(5):86-90.
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