my $publisher = $query->param('publisher_filter') || '';
my $bookseller = $query->param('bookseller_filter') || '';
my $biblionumber = $query->param('biblionumber') || '';
my $branch = $query->param('branch_filter') || '';
my $publisher = $query->param('publisher_filter') || '';
my $bookseller = $query->param('bookseller_filter') || '';
my $biblionumber = $query->param('biblionumber') || '';
my $branch = $query->param('branch_filter') || '';