Veress Márton: A Bakony természettudományi kutatásának eredményei 23. - Covered karst evolution... (Zirc, 2000)
PICTURES
Pict. 38. Ruined spherical cauldron in the valley side of Ördög-árok at Gizella pass. Its presence indicates that the cavity or cavities formed in the vicinity have been destroyed completely by now Pict. 39. Cave remnant of vertical position (Nagy Törkü-lik, Szilfakő Valley, Hajag)
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