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| 245 | 1 | 0 | _aBritannica yearbook of science and the future |
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_aChicago : _bEncyclopaedia Britannica, _c1971. |
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| 500 | _aEditors: 1971- , Richard G. Young | ||
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_aCIENCIA Y TECNOLOGIA-ANUARIOS _99874 |
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