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Water quality, atmospheric nitrogen deposition and herbaceous plant species richness in the USA, 1970-2011 This data release is comprised of a data set that contains specific conductance and chloride concentration data in HUC-8 watersheds that intersect with areas with unconventional oil and gas plays, and a data set that contains atmospheric nitrogen deposition rates and herbaceous plant species richness values across sample sites in the USA. Associated publication: Koenker, R., Chernozhukov, V., Xuming. and Peng, L., 2017, Handbook of quantile regression: Boca Raton, FL, CRC Press. Categories: Data; Tags: USGS Science Data Catalog (SDC), United States, environment, herbaceous plants, hydraulic fracturing, All tags... inlandWaters, nitrogen deposition, quantile regression, surface water quality, unconventional oil and gas plays, Fewer tags