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MedlinePlus (at National Library of Medicine/National Institutes of Health)
Alt HealthWatch
SIRS Discoverer Images
Science Reference Source
Biology: The eSkeletons Project
Merriam-Webster's Collegiate Dictionary (in Encyclopædia Britannica Online)
USA.gov (The U.S. Government's Official Web Portal)
Explora for Middle School
Georgia Library PINES (Public Information Network for Electronic Services)
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