| http://digfir-published.macmillanusa.com/calc_tutorial/calc_tutorial_15_6_013.html | Chapter 1. calc_tutorial_15_6_013
| 50c225f2b11c0f4c45000000 |
| http://digfir-published.macmillanusa.com/calc_tutorial/calc_tutorial_15_6_013_dlap.xml | DLAP questions | 50c225f2b11c0f4c45000000 |