||Opera Omnia, Vol.9|
Rome: American Institute of Musicology, 1987. Plate CMM 3.
This "urtext" or "scholarly" (scientific) edition was published at least 25 years ago in the EU (or 20 years ago in Italy, before 1995 in the former USSR). Hence, the edition is public domain in its country of origin or a government publication. Such editions are also public domain in Canada because they fail to meet the minimum 'threshold of originality' to qualify for copyright as an 'adaptation'. They may not be public domain elsewhere. More information about this can be found here.
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||Volume is called more informatively "Liber quinque missarum IV vocum, 1536" (copub.? with Hänssler. This refers to the title of the 1536 published(?) set of parts from Francesco Marcolini of Venice (Vinegia).