| File Name | Size | Date | |
 | Abacus_Handbook_2004.pdf | 787 KB | 5/16/2010 |
| Napiers_Bones_2004.pdf | 44 KB | 5/16/2010 |
| Napiers_Bones_Diy_2004.pdf | 209 KB | 5/16/2010 |
Index of PS-SURVIVAL/PS/Education/Ancient_Calculators |
| File Name | Size | Date | |
| Abacus_Handbook_2004.pdf | 787 KB | 5/16/2010 |
| Napiers_Bones_2004.pdf | 44 KB | 5/16/2010 |
| Napiers_Bones_Diy_2004.pdf | 209 KB | 5/16/2010 |