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

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Here is the original map I was imitating (2nd map in this document):
usproductionmaps.pdf

I thought it was difficult to see the dots in the original, therefore 
I simplified it a bit (removing the color from the map surface, for example).

Also, I went to great lengths to make sure I had a lat/long for every 
production location ... I ran 2 "proc geocodes", and then manually 
looked up the others (using Google satellite maps).  For example, the
original map did not plot the facility in Idaho, but I do plot it.

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