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Of Communion with God the Father, Son and Holy Ghost (John Owen)
Of God and His Creatures (St. Thomas Aquinas)
Of Justification by Faith and Works (William Law)
Of Prayer—A Perpetual Exercise of Faith. The Daily Benefits Derived from It. (John Calvin)
Of the Mortification of Sin in Believers (John Owen)
Old Testament in Greek According to the Septuagint, Vol. I: Genesis--IV Kings (H.B. Swete)
Old Testament in Greek According to the Septuagint, Vol. II: I Chronicles--Tobit (H.B. Swete)
Old Testament in Greek According to the Septuagint, Vol. III: Hosea--4 Maccabees (H.B. Swete)
On Christian Doctrine, in Four Books (St. Augustine)
On Cleaving to God (Albert the Great)
On Keeping the Heart (John Flavel)
On Loving God (St. Bernard of Clairvaux)
On Religion: Speeches to Its Cultured Despisers (Friedrich Schleiermacher)
On the Christian Life (John Calvin)
On the Government of God: A Treatise Wherein Are Shown by Argument and by Examples Drawn from the Abandoned Society of the Times the Ways of God To (Salvian)
On the Incarnation (St. Athanasius)
One-Year Bible Reading Calendar (Anonymous)
Opera Omnia (St. Thomas Aquinas) [Latin]
Oratory of the Faithful Soul; or, Devotions to the Most Holy Sacrament, and to Our Blessed Lady. (Louis of Blois [Ludovicus Blosius])
Origin of the Four Gospels (Constantin von Tischendorf)
Origin of the New Testament (Adolf Harnack)
Orthodox Russian-Language Classics (Anonymous) [Russian]
Other Russian-Language Classics (Anonymous) [Russian]
Our Daily Homily (F. B. Meyer)
Our Daily Homily (F. B. Meyer)
Our Man In Heaven: An Exposition of the Epistle to the Hebrews (Edward Fudge)
