That's decent code as it is. I can help with the range, though, if I'm reading it correctly. Try this:

for my $aref (@$STF3) {
    print OUTPUT qq|<li>$aref->[0] </li><a href="$aref->[1}$STF3_Table
+s">$aref->[2]</a><br />\n|;
}
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You could even throw printf in there, if you were so inclined.

Stylisticly, you can give a list of variables to my, and you usually don't need to initialize them explicitly. I generally say my ($foo, $bar, @baz, %kudra);.

You can also get rid of temporaries, like so:

return split(/\n/, $document);

return \@STF1, \@STF3;
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It also wouldn't hurt to select the OUTPUT filehandle. The only thing I'd ding you for on a code review would be the loops, and that's because you're only hurting yourself there. :)