Hi, May be of interest: Water Used for Hydraulic Fracturing Varies Widely Across United States http://www.usgs.gov/newsroom/article.asp?ID=4262&from=rss_home#.VZKiHPlVhHw I still receive research inquiries here in the Denver library about this news release from last month (May): The Chemistry of Waters that Follow from Fracking: A Case Study http://www.usgs.gov/newsroom/article.asp?ID=4213#.VZKiU_lVhHx Enjoy the day, Emily Emily C. Wild Librarian (Physical Scientist) U.S. Geological Survey, Denver Library Denver Federal Center ph: (303) 236-1003 [log in to unmask] USGS Libraries: http://library.usgs.gov Tutorials: http://tinyurl.com/lh3tmua Profile: http://profile.usgs.gov/ecwild