This book is an unedited reprint of the 1957 edition. From Title page: Edited and in part newly translated into English from the 1950 official edition "Enchiridion Indulgentiarum--Preces et Pia Opera" issued by the Sacred Penitentiary Apostolic by authorization of the Holy See. All prayers originally in Latin in the Typical Edition are given in English and Latin. Other prayers in English Only. These are the official prayers of the Catholic Church. Even though the Church has changed indulgences these prayers are timeless and an excellent aid to the Interior Life.