Half a century of cropland change.
The census concept of total cropland is a better measure of effective agricultural land than is total farmland, which includes extensive areas of woodland owned by farmers. The cropland area of the United States dropped from 478 million acres in 1949 to 431 million acres in 1997, for a net loss of l...
| Publicado en: | Geographical Review Vol. 91; no. 3; pp. 525 - 544 |
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| Formato: | Artículo |
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Wiley-Blackwell
July 2001
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| Acceso en línea: | Ver este registro en EBSCOhost |