The following are incorrect:

  If at all possible, you should consult the ``Installation Guide''
  document on the NetBSD/pmax web page, at http://www.netbsd.org/ports/pmax.

...

  Please follow the instructions at 

      http://www.netbsd.org/ports/pmax/pmax-install.html,

The correct URLs should be:

  http://www.netbsd.org/Ports/pmax/
  http://www.netbsd.org/Ports/pmax/pmax-install.html

Note the capital letter P in Ports.

I noticed a few other typos while skimming through-- who wants
to fix them? :)