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| Lerner, R. Purdue University. | Cabbage. | http:/ / www.hort.purdue.edu/ ext/ senior/ vegetabl/ cabbage1.htm |
| Department of Agriculture, Prince Edward Island Canada | Carrot production guide. | http:/ / www.gov.pe.ca/ agriculture/ index.php3?number=69747&lang=E |
| University of Illinois Extension. | Carrot. | http:/ / www.urbanext.uiuc.edu/ veggies/ carrot1.html |
| UC IPM. | Carrots. | http:/ / www.ipm.ucdavis.edu/ PDF/ PMG/ pmgcarrot.pdf |
| Purdue University. | Carrots. | http:/ / www.hort.purdue.edu/ rhodcv/ hort410/ carrot/ carrot.htm |
| Central Tuber Crops Research Institute. | Cassava agroforestry systems. | http:/ / fadr.msu.ru/ rodale/ agsieve/ txt/ vol2/ 7/ art2.html |
| CGIAR. | Cassava. | http:/ / www.cgiar.org/ impact/ research/ cassava.html |
| CRFG. | Cherimoya fruit. | http:/ / www.crfg.org/ pubs/ ff/ cherimoya.html |
| UC IPM. | Citrus. | http:/ / www.ipm.ucdavis.edu/ PDF/ PMG/ pmgcitrus.pdf |
| Coffee Research Institute. | Coffee plant. | http:/ / www.coffeeresearch.org/ agriculture/ coffeeplant.htm |
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