『Introduction
　Elevated nitrate concentrations in groundwater have become a concern worldwide, especially since the rise of artificial fertilizers after the Second World War, leading to increased monitoring.　As one tool, time series analysis of groundwater nitrate concentrations has become commonplace. During the course of an extensive nitrate literature review for the Minnesota Pollution Control Agency, some early groundwater nitrate curves were found in literature, dating to the mid-1880s English countryside.』

Rothamsted experimental station
Visualizing groundwater data
Conclusions
Acknowledgments
References