Unconventional oil and gas spills: Materials, volumes, and risks to surface waters in four states of the U.S. - Maloney, Kelly; Baruch-Mordo, Sharon; Patterson, Lauren; Nicot, Jean-Philippe; Entrekin, Sally; Fargione, Joe; Kiesecker, Joseph; Konschnik, Kate E.; Ryan, Joseph; Trainor, Anne; Saiers, James; Wiseman, Hannah (Science of the Total Environment, 2017)