/** * Find volumes filtered by the subject. * * @param string $subject * @param int $start * @param int $count * * @return Volumes */ public function lookupBySubject($subject, $start = 0, $count = VolumesSearch::MAX_RESULTS) { /** @var VolumeSearchQuery $query */ $query = new VolumeSearchQuery(); $query->setSubject($subject); return $this->lookup($query, $start, $count); }