Use of the herbicide chlorsulfuron in the USA to 2017, estimated by the US Geological Survey
US Geological Survey
<a rel="nofollow" class="external free" href="https://water.usgs.gov/nawqa/pnsp/usage/maps/show_map.php?year=2017&amp;map=CHLORSULFURON&amp;hilo=H&amp;disp=Chlorsulfuron">https://water.usgs.gov/nawqa/pnsp/usage/maps/show_map.php?year=2017&amp;map=CHLORSULFURON&amp;hilo=H&amp;disp=Chlorsulfuron</a>