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To construct maps depicting crop yield throughout California, are there statewide datasets, or would I need to add data by county?

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I think this question is too narrowly focussed for this site, especially since it's a one-liner with no (visible) history of things that have been tried already to find an answer. That said, I think the answer would be to contact the California Department of Food & Agriculture and ask them. Failing responsiveness there, from their statistics page pdf's pull out the tables ordered by county and join to any standard county map set. The downloadable reports go back at least 20 years. – matt wilkie Nov 14 '12 at 5:29

Farmland Mapping and Monitoring Program (FMMP)

FMMP has GIS data by county showing some different kinds of farmlands.

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