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The 3d_navigation

Hello,everyone.I am a new student about the ros.I find a good package for our project-3d_navigation.The page is ‘‘http://wiki.ros.org/3d_navigation’’.But I cannot download the package for the code.ros.org.It cannot be visited.Ah,I want to know that what’s wrong with it?How could I get the package at otherwhere?
Please,our project really need it.Thank you very much for solving it.