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Riding lawn mowers vary quite a bit from model to model. There are small rear-engine mowers for yards up to an acre and lawn ...
New Tracers Identify Hydraulic Fracturing Fluids and Accidental Releases from Oil and Gas Operations
† Division of Earth and Ocean Sciences, Nicholas School of the Environment, Duke University, Durham, North Carolina 27708, United States ‡ Department of Earth Sciences, Dartmouth College, Hanover, New ...
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