Abstract: An indexed book of information bits has a hierarchal structure of primary headings and secondary headings within each primary heading. Each secondary heading includes a group of information bits associated therewith. The pages of the book are bound at first edges in a spine, include primary markings representing primary headings along second edges, and include secondary markings representing secondary headings along third edges. Indicating portions are provided along each of the second and third edges to associate each page with a respective primary heading and a respective secondary heading.