Happy Feast Day of the Immaculate Conception of the Blessed Virgin Mary!
From the Winter volume of the Roman Breviary in English: Restored by the Sacred Council of Trent; Published by Order of the Supreme Pontiff St. Pius V, and Carefully Revised by Other Popes; Reformed by Order of Pope Pius X; According to the Vatican Typical Edition, with the New Psalter of Pope Pius XII; Compiled from Approved Sources (Ed. Right Rev. Msgr. Joseph A. Nelson; New York: Benziger Brothers, Inc., 1950), here is the Office for the Feast of the Immaculate Conception of the Blessed Virgin Mary.