I'd like to use the Latin introit for Ash Wednesday. The NOH volumes are great but not the easiest directory for me to navigate. I was hoping someone with more experience with them might tell me which book to look in for Ash Wednesday propers.
You'll find the Introit for Ash Wednesday on pp. 156-158 of Volume I of the Nova Organi Harmonia, available online courtesy of Corpus Christi Watershed:
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