File:US Civil Defense Regional Boundaries and Field Installations.png
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![File:US Civil Defense Regional Boundaries and Field Installations.png](https://upload.wikimedia.org/wikipedia/commons/thumb/7/7e/US_Civil_Defense_Regional_Boundaries_and_Field_Installations.png/760px-US_Civil_Defense_Regional_Boundaries_and_Field_Installations.png?20171211142738)
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