"nrc-renewable-2011" . "Renewable Fuel Standard: Potential Economic and Environmental Effects of U.S. Biofuel Policy"^^ . "2011"^^ . "10.17226/13105" . "report" . . . . . . . . . . . . . _:genid1 . _:genid1 . _:genid1 . _:genid1 . _:genid2 . _:genid2 . _:genid2 . _:genid2 .