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Borehole logging
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Gamma-ray logging
Recording of the measurements of natural gamma radiation emitted from the rocks in a borehole to study the subsurface structures.
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Stratigraphy
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Characterizing contaminant concentrations with depth by using the USGS well profiler in Oklahoma, 2003-9
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Use of specialized sampling equipment to study public water supply wells, with examples showing Arsenic in two aquifers.
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