Hi, I just downloaded the 8 volume of the Nova Organi Harmonia and when I checked this site http://www.christusrex.org/www2/cantgreg/all_masses.html for the 30th Sunday of the month, the intro is listed as Ps. 104, 3.4 et 1 Lætetur cor but I cannot find it in the Nova Organi Harmonia....
Please see a very similar question I asked here, and the kind responses I received regarding the differences between the pre-1974 calendar and current usage. (Look for my latter posts on Oct. 11.)
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