'''[http://agricola.nal.usda.gov/ AGRICOLA (via NAL)]''' is an index of sources on all aspects of agriculture, forestry, and animal science updated monthly covering from 1970 - to the present. From the [http://agricola.nal.usda.gov/ National Agriculture Library].
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'''[https://agricola.nal.usda.gov/ AGRICOLA (via NAL)]''' is an index of sources on all aspects of agriculture, forestry, and animal science updated monthly covering from 1970 - to the present. From the [https://agricola.nal.usda.gov/ National Agriculture Library].