All the software referenced in this "HOWTO" is available on the usual Internet anonymous ftp sites.
Looking in /news on ftp.uu.net is usually a good way to start.
The newspak-2.1.tar.z distribution contains config files and readme files related to building uucp, news, and mail software under Linux from the various freely-available sources. It can usually be found on sunsite.unc.edu in the directory /pub/Linux/system/Mail.