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|usageTrend||<p> Number - Relatively high usage (10 times/year over the past two years, due to renewed interest in the Marcellus Shale as a possible gas target) probably peaked in 2008. Usage was much rarer before that, and will probably diminish in the future. Types - energy or gas production and exploration companies</p>|
|unit||Items (Items, http://www.sciencebase.gov/vocab/category/NGGDPP/collection/unit)|