Enormous thanks to the correspondent who revealed the existence and usefulness of the Concordantia Missalis. I could create quite a case out of those references.
But ... am I right? ... it doesn't give the sources of the formulae; whether from a Sacramentary or newly composed. Where would I turn for that information?
On another subject entirely ... what the Pelagians thought about grace can be accessed via the de Gratia Christi et de Peccato Originali.
On another subject entirely ... a friend points me to a blog called Holy Smoke, which appears under the pseudonym 'Damian Thompson'. The writer seems to have a dislike of Catholic Anglicans which, in the comments anonymous others have added to his post, becomes almost pathological. He and they appear to be quite sympathetic to at least some of the features of our Holy Father's agenda but to be totally unaware of the long history of sympathy towards Catholic Anglicans shown by Joseph Ratzinger; and, for that matter, by theologians closely in line with Ratzinger's thought such as Aidan Nichols. It would be a sad day for the 'Thompsons' of this world - but a splendid day for Catholic Anglicans - if papa Ratzinger were to give Nichols the See of Westminster.
'Damian Thompson' is a curious pseudonym. It invites speculation about ... but no; perhaps correspondents can unpack its semiology.