| http://www.w3.org/ns/prov#value | - After tapping it for yields of 10 biodiesel crops, such as soybean, rapeseed and oil palm, and 10 ethanol feedstocks, including corn, rice and wheat, Johnston calculated and mapped the amount of biofuel that could be produced per hectare in every possible country by crop combination - some 3,000 in all.
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