2D AND 3D Contour Graphics [Model 64.9517]

HP 9845 Series pack. published by Hewlett-Packard

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2D AND 3D Contour Graphics [Model 64.9517] © 198? Hewlett-Packard

Published trough the HP Exchange Library Software publishing platform. The principle was simple: If you needed one of the software packages, you could either contribute your own software and get three programs of your choice for free, or you had to pay a nominal transcription fee of $25.
Soft's package.