| http://digfir-published.macmillanusa.com/calc_tutorial/calc_tutorial_13_5_017.html | Chapter 1. calc_tutorial_13_5_017
| 50c9edf4b11c0f886c000000 |
| http://digfir-published.macmillanusa.com/calc_tutorial/calc_tutorial_13_5_017_dlap.xml | DLAP questions | 50c9edf4b11c0f886c000000 |