> This book is intended to show the many resources available with the HP Voyagers HP10C, HP11C, HP12C, HP15C and HP16C. These calculators are state-of-the-art products made by Hewlett-Packard Company and are meant to be precise, long lasting, high-quality tools for personal computa- tion. If you do not have access to or do not know any of these calculators, this is the very moment to get acquainted to their powerful resources.