| http://digfir-published.macmillanusa.com/hm_custom_osu/hmlsu_wischusen_f13laboratorytechniques_prelab.html | Chapter 2. Laboratory Techniques
| 51d46b1b757a2ecc23000017 |
| http://digfir-published.macmillanusa.com/hm_custom_osu/hmlsu_wischusen_f13laboratorytechniques_prelab_dlap.xml | DLAP questions | 51d46b1b757a2ecc23000017 |