Still further in accordance with the present invention, the pipe to soil potential measurement may be made utilizing {TAIL ~ electrical ground cables} or similar structures in urban areas in {HEAD ~ the vicinity} of power grid substations, for example 
Still further in accordance with the present invention , the pipe to soil potential measurement may be made utilizing { TAIL ~ electrical ground cables } or similar structures in urban areas in { HEAD ~ the vicinity } of power grid substations , for example
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