Polyphony
Book of Hours Source: https://www.e-codices.unifr.ch/ Basel, Universitätsbibliothek, AN VIII 45, 4r.
Book of Hours Source: https://www.e-codices.unifr.ch/ Basel, Universitätsbibliothek, AN VIII 45, 4r.
Book of Hours Source: https://www.e-codices.unifr.ch/ Basel, Universitätsbibliothek, AN VIII 45, 14r.