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. 2017 Aug 23;125(8):086004. doi: 10.1289/EHP1535

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EHP is an open-access journal published with support from the National Institute of Environmental Health Sciences, National Institutes of Health. All content is public domain unless otherwise noted.

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Figure 2A is a map of USA marking distribution of the ratio of conventional to unconventional wells across states. Figure 2B is a map of USA marking distribution of the oil, wet gas and dry gas wells across states. — Ratio of (A) conventional to unconventional wells, and (B) oil, wet gas, and dry gas wells, by state. Well data are from DrillingInfo (http://info.drillinginfo.com/). Administrative boundaries are from the U.S. Census Bureau (2014).