update: they appear to be back online at their usual address:
   [1]http://nsarchive.gwu.edu/
   - z

   On Mon, Dec 26, 2016 at 2:41 AM, Georgi Guninski
   <[2]guninski@guninski.com> wrote:

     On Sun, Dec 25, 2016 at 09:23:25AM -0800, Rayzer wrote:
     > The [3]nsarchive.gwu.edu page now redirects to GWU's home page.
     >
     They are still archived on [4]https://archive.org
     Searching there without "http" returns some tarballs too.

References

   1. http://nsarchive.gwu.edu/
   2. mailto:guninski@guninski.com
   3. http://nsarchive.gwu.edu/
   4. https://archive.org/