"nrc-sustainable-agriculture-2010" . "Toward Sustainable Agricultural Systems in the 21st Century"^^ . "2010"^^ . "10.17226/12832" . "report" . . . . . . . . . . . _:genid1 . _:genid1 . _:genid1 . _:genid1 . _:genid2 . _:genid2 . _:genid2 . _:genid2 . _:genid3 . _:genid3 . _:genid3 . _:genid3 .