try 
-values=>\@publication_categories

[download]
instead.
this is CGI's POD. The link is to the online version located on CPAN, so it may be a different one than what you've got on your system, but perldoc cgi at a command line should present you with the appropriate documentation on your system.

In reply to Re: using an array to propagate a CGI menu by boo_radley
in thread using an array to propagate a CGI menu by newatperl

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