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For more than 150 years, in print and now online, Merriam-Webster has been America's leading and most-trusted provider of language information. Each month, our Web sites offer guidance to more than 40 million visitors. In print, our publications include Merriam-Webster's Collegiate Dictionary (among the best-selling books in American history) and newly published dictionaries for English-language learners. All Merriam-Webster products and services are backed by the largest team of professional dictionary editors and writers in America, and one of the largest in the world.

"Find used books, out of print books, textbooks, rare books and new books for sale. Search hundreds of millions of books from over 100,000 booksellers and 60+ websites worldwide"

"Find used books, out of print books, textbooks, rare books and new books for sale. Search hundreds of millions of books from over 100,000 booksellers and 60+ websites worldwide"

Library of Congress Prints and Photographs Online Catalog

Open access to 646,209 e-prints in Physics, Mathematics, Computer Science, Quantitative Biology, Quantitative Finance and Statistics

is the most comprehensive scientific research tool on the web. With over 410 million scientific items indexed at last count, it allows researchers to search for not only journal content but also scientists' homepages, courseware, pre-print server material, patents and institutional repository and website information.

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is the most comprehensive scientific research tool on the web. With over 410 million scientific items indexed at last count, it allows researchers to search for not only journal content but also scientists' homepages, courseware, pre-print server material, patents and institutional repository and website information.