?url_ver=Z39.88-2004&rft_id=10.1073%2Fpnas.1213871110&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.au=Olmstead%2C+Sheila+M.&rft.aulast=Olmstead&rft.aufirst=Sheila+M.&rft.issue=13&rft.volume=110&rft.date=23+March+2013&rft.issn=0027-8424&rft.atitle=Shale+gas+development+impacts+on+surface+water+quality+in+Pennsylvania&rft.title=Proceedings+of+the+National+Academy+of+Sciences+of+the+United+States+of+America&rft.pages=4962-4967&rft.genre=article