| http://digfir-published.macmillanusa.com/hm_custom_osu/hmosu slides-experiment 1.html | Chapter 1. Scientific Measurements
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| http://digfir-published.macmillanusa.com/hm_custom_osu/hmosu slides-experiment 1_dlap.xml | DLAP questions | 500d6b9db11c0f3d31000000 |