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http://www.tutoriallounge.com/2009/11/30-ultimate-useful-autocad-tutorials
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http://www-roc.inria.fr/gamma/download/download.php
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http://cadsymbol.kinnarps.se/html/en/sum1000212000000000.html
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http://www.archibase.net/gdl
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http://sweethome3d.sourceforge.net/importModels.html#WebSitesWithModels
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http://www-c.inria.fr/gamma/download/download.php