National Science Digital Library (NSDL)
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|A comprehensive online source for science, technology, engineering and mathematics education. The NSDL mission is to both deepen and extend science literacy through access to materials and methods that reveal the nature of the physical universe and the intellectual means by which we discover and understand it.|
|Levels:||Elementary, Middle School (6-8), High School (9-12)|
|Resource Types:||Link Listings, Reference Sources|
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