Simtel MSDOS Archive CDROM, March 1997.  Walnut Creek CDROM.
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 Graphing
 path: \disc1\graph 
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grafit20.zip Graphs functions; solves sys. of inequalities
grphme10.zip Simple-to-use 3-D graphing package, vers 1.0
pcgr21.zip   Comprehensive PC Graph drawing package v2.1