Brian, the following link from that same page works for me:
On Sat, Jan 14, 2012 at 10:40 PM, BRIAN TINGLE
<[log in to unmask]> wrote:
> FYI, I can't find the EAD dtd file on the loc website. It looks like the files were hosted on an ftp server at LOC at one point.
> -- Brian
> PS does anyone know why the DTD has a dozen odd unused "<!NOTATION"s (such as to METS, MODS, tiff, jpeg, mpeg).