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_a333.72 _bUSE |
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_aUse and conservation of the biosphere / _cby UNESCO |
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_bUNESCO _aParis _c1970 |
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_aTe United Nations Educational, Scientific and Cultural Organisation _bParis _e7e |
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_a272p. _c24cm(Hb) |
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_a Conservation of natural resources. _914273 |
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