@ -125,6 +125,8 @@ class BookSearch
$bs = new static();
$bs->addOrQuery($codes, $field);
$bs->addSortField('author', \SolrQuery::ORDER_ASC);
$bs->addSortField('title', \SolrQuery::ORDER_ASC);
$results = $bs->getResults(0, $count);
return $results['books'];
}