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The collected works of Thomas Aquinas are being edited in the Editio Leonina (established 1879). As of 2014, 39 out of a projected 50 volumes have been published.
The works of Aquinas can be grouped into six categories as follows:
- Works written in direct connection to his teaching
- Twelve quodlibetal disputations
- Philosophical commentaries
- Eleven commentaries on Aristotle
- Two expositions of works by Boethius
- Two expositions of works by Proclus
- Lesser tractates and disputations
- Five polemical works
- Five expert opinions, or "responsa"
- Fifteen letters on theological, philosophical, or political subjects
- A collection of glosses from the Church Fathers on the Gospels
- Systematic (main) works (Summa Theologiae, Summa contra Gentiles)
- Biblical commentaries (including commentaries on Job, Psalms and Isaiah, Canticles and Jeremiah, John, Matthew, and on the epistles of Paul, and the Catena aurea, a monumental collection of glosses by the Church Fathers on each verse of the Gospels),
- Nine exegeses of Scriptural books
- Liturgical hymns
Editions
In 1570 the first edition of Aquinas' opera omnia, the so-called editio Piana (from Pius V, the Dominican Pope who commissioned it), was produced at the studium of the Roman convent at Santa Maria sopra Minerva, the forerunner of the Pontifical University of Saint Thomas Aquinas, Angelicum. The critical edition of Aquinas' works is the ongoing edition commissioned by Pope Leo XIII (1882-1903), the so-called "leonine edition. Abbé Migne published an edition of the Summa Theologiae, in four volumes, as an appendix to his Patrologiae Cursus Completus. English editions: Joseph Rickaby (London, 1872), J. M. Ashley (London, 1888).