Volume 23 of the Patrologia Graeca contains the start of Eusebius’ monster commentary on the Psalms. At the start of it is a preface, presumably by Bernard de Montfaucon, the 18th century Benedictine scholar. It’s the size of a small book itself!
It would be interesting to know whether Eusebius takes a literal or allegorical approach in this work. He was very much a disciple of Origen, whose enthusiasm for the allegorical method led him to the curious statement that the literal meaning of some passages of scripture is of no importance. But he was also his own man.
I had wondered about commissioning a translation of the preface; but not at that length!