An, H., Hyun, Y., Lee, S. J., Kim R-. H., Cho, H., Jeen, S-. W.*, 2022. Trend analysis for the nitrate-nitrogen and chloride data of the National Groundwater Quality Monitoring Network for systematic groundwater quality management. Journal of Geological Society of Korea, no. 1, 101-116. http://dx.doi.org/10.14770/jgsk.2022.58.1.101