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035 | _aUPN01000052862 | ||
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_aLB1585 _bS2.9 |
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_aScience : _bunderstanding your environment : level one. |
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_aMorristown (E. U.A.) : _bS. Burdett, _cc1975. |
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_a16, 160 p. : _bil. col. |
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_aCiencia _xEstudio y enseƱanza (Elemental) _97402 |
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