I just noticed that the 1891 work edited by Ryles and James on the Psalms of Solomon ("Psalms of the Pharisees, Commonly Called the Psalms of Solomon")--broken into three resources by Logos, one for the Greek text, one for the English translation and one for the commentary--is tagged as type:Bible, and for the commentary resource, type:Bible Commentary. I'm not aware of any tradition that recognizes this text as canonical?
