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Active Sites Directory is a free directory which covers a large variety of sites organized by category. Browse thousands of web sites that are more focused on one particular aspect of Science, Astronomy, Business, Books and Magazines with just the click of your mouse.

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See also:

    http://www.cosmobrain.com/bookstore/bookstore2.html   » Cosmobrain Astronomy Bookstore - Online astronomical bookstore including over 500 selected titles divided by subject. Worldwide shipping. Safe shopping guarantee.

    http://www.kalmbach.com/   » Kalmbach Publishing Co. - Publisher of Astronomy magazine and other astronomy products.

    http://willbell.com/   » Willmann-Bell, Inc. - Publishers and booksellers serving astronomers worldwide since 1973. On-line catalog and ordering.

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