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    Figure 2: Locations of Unconventional Reservoirs in the United States

    This image is excerpted from a U.S. GAO report:

    www.gao.gov/products/GAO-12-874

    UNCONVENTIONAL OIL AND GAS DEVELOPMENT: Key Environmental and Public Health Requirements

    Note: The map for tight sandstone basins is based off Energy Information Administration data for “tight gas,” which includes both tight sandstone and tight carbonate formations.

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