| http://digfir-published.macmillanusa.com/hm_custom_osu/feige52793f12_lab12_exercise.html | Chapter 1. Exercise: Heart Identification
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| http://digfir-published.macmillanusa.com/hm_custom_osu/feige52793f12_lab12_exercise_dlap.xml | DLAP questions | 521e07f0757a2edc75000016 |