| http://digfir-published.macmillanusa.com/hm_custom_osu/hmlsu_wischusen_lab1f13.html | Chapter 2. Laboratory Techniques: Pipets
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| http://digfir-published.macmillanusa.com/hm_custom_osu/hmlsu_wischusen_lab1f13_dlap.xml | DLAP questions | 516707bcb11c0fab6a000001 |