"usgs-factsheet-2013-3020" . "National Assessment of Geologic Carbon Dioxide Storage Resources—Summary: U.S. Geological Survey Fact Sheet 2013–3020"^^ . "2013"^^ . "http://pubs.usgs.gov/fs/2013/3020/pdf/FS2013-3020.pdf"^^ . "report" . . . . . . . _:genid1 . _:genid1 . _:genid1 . _:genid1 . _:genid2 . _:genid2 . _:genid2 . _:genid2 . _:genid3 . _:genid3 . _:genid3 . _:genid3 .