O Sweet, Loving Mary, Mother most pure and most chaste, thou hast shown unto us the secrets of thy most holy Rosary. Grant, I beseech thee, thy special blessings and graces upon all your children of this parish and diocese, that more may come to pray the Rosary every day and to partake of the Sacrifice of the Holy Mass. Show unto disbelievers, O Most Blessed Virgin Mary, the powers of thy most Holy Rosary in defeating heresies, converting sinners, and bringing all unto thy merciful son, Jesus, through His life, passion, death and Resurrection. Amen.
–This was on a prayer card I memorized when I was a teenager. I don’t know what it’s “called,” who wrote it, etc., but I usually say it before the Rosary.