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MERLOT "MERLOT is a curated collection of free and open online teaching, learning, and faculty development services contributed and used by an international education community."
National Science Digital Library "The National Science Digital Library provides high quality online educational resources for teaching and learning, with current emphasis on the sciences, technology, engineering, and mathematics (STEM) disciplines
New York Public Library | The Picture Collection " The Picture Collection For those who seek knowledge and inspiration from visual materials, the Picture Collection Online presents more than 30,000 digitized images from books, magazines and newspapers as well as original photographs, prints and postcards, mostly created before 1923"