They were riveted to the fore-edge of the front covers and many of them have been pulled away and lost.
ðeɪ wɜː ɹˈɪvɪɾᵻd tə ðə fˈɔːɹˈɛdʒ ʌvðə fɹˈʌnt kˈʌvɚz ænd mˈɛnɪəv ðˌɛm hɐvbɪn pˈʊld ɐwˈeɪ ænd lˈɔst.