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. Author manuscript; available in PMC: 2020 Jan 1.
Published in final edited form as: Environ Int. 2018 Dec 12;122:381–388. doi: 10.1016/j.envint.2018.12.011

Figure 2.

Figure 2.

Distribution of producing natural gas wells in Oklahoma from 1997–2009 (excluding Osage Nation). Sources: Natural Gas Wells: Oklahoma Corporation Commission; Oklahoma Freeways: Federal Highway Administration, National Transportation Atlas.