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| 090 | _aFolleto 3960 | ||
| 110 |
_aAcademia Nacional de Ciencias. Washington, D. C. _9383 |
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| 245 | _aPrinciples of resources conservation policy ; with some applications to soil and water resources | ||
| 260 |
_aWashington : _bNAS, _c1961 |
||
| 300 |
_a50 p. _b; gráfs. |
||
| 490 |
_aNAS. Publication _v; 885 |
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| 590 |
_aBATCH-UPD _b10 _c20130110 _lUCH01 _h0051 |
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| 590 |
_aCONVERSION _b10 _c20130109 _lUCH01 _h1317 |
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| 650 | 1 | 4 |
_aRecursos naturales _xConservación. |
| 830 | 0 |
_aNAS. Publication _v; 885 _980258 |
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| 901 | _aBK | ||
| 942 | _cFOLL | ||
| 949 |
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