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www.nsdl.org

NSDL.org - The National Science Digital Library

NSDL.org is an online science library with links to high quality science, technology, engineering, and math resources for K-12 teachers, faculty, librarians, students and informal learners. Funded by the National Science Foundation.

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#5 in Science Teaching, #8 in Virtual Libraries, #17 in Science Resources, #23 in Digital Libraries, #98 in Earth Science, #268 in Teaching Resources, #297 in Educational Resources, #474 in Teaching, #799 in E Learning, #969 in Chemistry