New York City Department of Environmental Protection: Briefing to the NYC Water Board on the Natural Gas Impact Assessment Project,
, NYC Water Board, p.24 - 24, (2009)
New York City Department of Environmental Protection. 12/23/2009. Impact Assessment of Natural Gas Production in the New York City Water Supply Watershed. 24 pages.
See: Bruce Stutz. Mar. 25, 2010. "A Contoversial Drilling Practice Hits Roadblock in New York." Yale University. Environment360