houghtonlib:Catholic Church. Incipit officiu[m] beate Marie v[ir]ginis secu[n]du[m] co[n]suetudine[m
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houghtonlib:Catholic Church. Incipit officiu[m] beate Marie v[ir]ginis secu[n]du[m] co[n]suetudine[m] Romane curie. Naples : Mattia Moravo, 3 October 1487.Typ Inc 6706.5Houghton Library, Harvard University -- source link
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