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| 999 |
_c67777 _d67777 |
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| 020 | _a107981 | ||
| 041 | _aEN | ||
| 082 |
_a551.44 _bINT _223 |
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| 100 | _aPROCEEDINGS of the 6th international Congress of Speleology | ||
| 245 | _aInternational Speleology 1973 | ||
| 260 |
_aPraha _bAcademia _c1976 |
||
| 300 | _a331 p. | ||
| 509 | _aNS | ||
| 942 | _cS | ||