$resultsloop{biblionumber} = $biblio->{'biblionumber'};
$resultsloop{author} = $biblio->{'author'};
$resultsloop{publishercode} = $biblio->{'publishercode'};
- $resultsloop{publicationyear} = $biblio->{'publicationyear'};
+ $resultsloop{publicationyear} = $biblio->{'publicationyear'} ? $biblio->{'publicationyear'} : $biblio->{'copyrightdate'};
$resultsloop{issn} = $biblio->{'issn'};
push @results, \%resultsloop;