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| 090 | _aB-15740 | ||
| 245 | 1 | 0 | _aPush to the Desert: the pressure of agriculture on California's arid lands ilustrates the law of diminishing returns |
| 490 | 0 | _vScience, 129(3359), p.1329-1339, 1959 | |
| 520 | 3 | _aOne-third of the land surface of the earth has a dry climate, and these lands comprise the largest area of any of the climate regions.It is not surprising, then, that with the present rapid increase in population, the densely populated areas of the world are pressing ever more intensely on the margins of the dry land. | |
| 650 | 1 | 4 | _aDESIERTO |
| 650 | 1 | 4 | _aAGRICULTURA |
| 650 | 1 | 4 | _aCALIFORNIA |
| 700 | 1 | 2 | _aGregor, Howard F. |
| 856 | 4 | 0 |
_uhttps://drive.google.com/file/d/1jN0AYQQ40SATqeAT9175-T1aLWJji0IS/view?usp=drivesdk _zPara ver el documento ingresa a Google con tu cuenta: @cicy.edu.mx |
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