Click here to see the SAS code.
Click here to see the example.

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Imitation of, and Data from:

http://water.usgs.gov/nawqa/trace/pubs/geo_v46n11/fig1.html
http://water.usgs.gov/nawqa/trace/arsenic/
http://water.usgs.gov/nawqa/trace/data/arsenic_nov2001.xls

It's a pretty cool example in that it uses a macro to generate
a drill-down map for each state, and uses the fairly new
proc ginside to determine which markers to plot in each
drilldown map.

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