| http://digfir-published.macmillanusa.com/envsci_graphing_tutorial/envsci_graphing_tutorial_graphing_skills_mini_tutorial.html | Chapter 1. Graphing Skills Tutorial
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| http://digfir-published.macmillanusa.com/envsci_graphing_tutorial/envsci_graphing_tutorial_graphing_skills_mini_tutorial_dlap.xml | DLAP questions | 50d213cdb11c0f721b000000 |