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_aAllen, Shirley Walter. _94409 |
| 245 | _aConserving natural resources; principles and practice in a democracy | ||
| 260 |
_aNew York : _bMcGraw-Hill, _c1955 |
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_a347 p. _b: ilus |
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_aBATCH-UPD _b10 _c20130110 _lUCH01 _h1949 |
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_aRecursos naturales _xConservación. |
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