91 Questions and Answers on the Catholic Church as the one, true Church of Christ--proofs, Scriptural basis, origin of the word Catholic, four marks of the Church (one, holy, Catholic, apostolic), errors in the Church, bad popes, St. Peter, can Protestants be saved, etc.
79 Questions and Answers on artificial birth control--why the Catholic Church is against it, financial hardships of having children, danger of overpopulation, bachelor priests as unfit to teach against birth control, role of prayer and self-denial, danger to the mother's life, unfit parents, eugenic considerations, large families vs. higher standard of living and education, etc.
67 Questions and Answers on the Holy Eucharist--the Real Presence of Christ, Scriptural basis, Transubstantiation, the Mass as a sacrifice, Communion under one form, the state of grace as a requirement for receiving Communion, the results of frequent Communion, lack of spiritual improvement from frequent Communion, etc.
116 Questions and Answers on Marriage--its indissolubility, impediments to marriage, remarriage of widows and widowers, the Pauline Privilege, separation, annulment, mixed marriages, the promise to raise all children Catholic, divorce and remarriage, apparent divorces of famous Catholics, Church law vs. civil law, etc.
76 Questions and Answers on Confession--Scriptural basis, Confession in the early Church, the gift of healing in former Christian times, confessing to a mere man, confessing and sinning again, etc. Plus a conversion testimony from a former Baptist minister.
44 Questions and Answers on Indulgences--what they are and are not, how they work, the Church's authority to grant them, indulgences in Scripture and the early Church, abuses and supposed sale of indulgences, etc.
3 vols. 4,374 questions and answers on every conceivable aspect of the Catholic Faith by these intrepid preachers. Clear, succinct, uncompromising, and powerful. Best refutation of Protestantism in print. Indexed. Very famous.