• SAS marcos to plot symbols on maps 

    Hess, Mimi Cheih; Hess, Micheal (University of Missouri. Extension Division, 1981)
    "At present, SAS/Graph does not have a facility to allow you to easily draw symbols on a map plotted by GMAP. I will describe a set of SAS macros that will allow you to draw symbols on a map produced by Gmap."--First paragraph