Periodicals Homepage. Reprints and antiquarian backsets. Over 3,000,000 back volumes to complete gaps in collections or replace ageing originals. Backstock management agreements with publishers.

This WebElements periodic table page contains Essential information for the element ununhexium

Award winning periodic table, with user-friendly element data and facts. Cool, online chemistry videos, dictionary, tools and forum.

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The Library of Congress. The Library of Congress is the nation's oldest federal cultural institution, and it serves as the research arm of Congress. It is also the largest library in the world, with more than 120 million items. The collections include books, sound recordings, motion pictures, photographs, maps, and manuscripts.