| http://digfir-published.macmillanusa.com/howdoweknow/hdwk12_2.html | Chapter 1. How Do We Know 12.2
| 507452dbb11c0fc722000000 |
| http://digfir-published.macmillanusa.com/howdoweknow/hdwk3_1.html | Chapter 1. How Do We Know 3.1
| 50febc6bb11c0fea59000000 |
| http://digfir-published.macmillanusa.com/howdoweknow/hdwk3_1_testing_copy_for_adam.html | Chapter 1. How Do We Know 3.1
| 51c4e4ce757a2ebf28000018 |