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| 020 | _a9231019007 | ||
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_a913 _bUNE _223 |
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| 110 |
_996981 _aUnesco |
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| 245 | _aAppropriate technologies in the conservation of cultural property | ||
| 260 |
_aParis _bUNESCO _c1981 |
||
| 300 | _a136 p. | ||
| 942 | _cR | ||