National Media Coverage of Hydraulic Fracturing in the United States: Evaluation Using Human and Automated Coding Techniques

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National Media Coverage of Hydraulic Fracturing in the United States: Evaluation Using Human and Automated Coding Techniques
Benjamin Blair, Tanya Heikkila and Christopher M. Weible

http://onlinelibrary.wiley.com/doi/10.1002/rhc3.12097/full