How can I list all cronjobs created by puppet?

I have several crontabs defined in a pp file, e.g:

cron { 'puppet-cron1':
    ensure  => present,
    command => "cat /etc/issue",
    user    => root,
    minute  => '*/30',
}
cron { 'puppet-cron2':
    ensure  => present,
    command => "cat /etc/issue",
    user    => www-data,
    minute  => '*/30',
}

How do I list all cronjobs created by puppet on a system?

I tried puppet ressource cron, which lists only the root cronjob:

cron { 'puppet-cron1':
  ensure  => 'present',
  command => 'cat /etc/issue',
  minute  => ['*/30'],
  target  => 'root',
  user    => 'root',
}