| http://www.w3.org/ns/prov#value | - Charlie Foxtrot says: May 6, 2011 at 12:17 pm I wonder if they controlled for such factors as political upheaval, government mandates, local economic conditions, drought due to long term climate variability, thermometer error due to local development, loss of farm land to development, over-farming, cost of fuel, etc. etc.
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