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| HP-28S Advanced Scientific Calculator Käyttöopas | March, 1990 |
| HP28-S Advnaced Scientific Calculator Reference Manual | August, 1989 |
| Hewlett-Packard Journal | 1988 |
| This page has been created by Sami Rautiainen. | |
| Read the small print. | Last content update: 2004-06-27 |