On the Longer Rules by Leo Eusebius Paperback Book

On the Duties of the Clergy by Leo Eusebius Paperback Book

On Hexaemeron by Leo Eusebius Paperback Book

On the Fount of Knowledge by Leo Eusebius Paperback Book

Clement of Rome for Beginners by Leo Eusebius Paperback Book

On the Holy Spirit (De Spiritu Sancto) by Leo Eusebius Paperback Book

On the Trinity (De Trinitate) by Leo Eusebius Paperback Book

The End of Population Growth by Ugo Bardi Paperback Book