openmarginalis: Detail of Graduale oesa, Proprium de tempore, pars aestivalis, Ms. WettFm 2, f. 3r,
openmarginalis:Detail of Graduale oesa, Proprium de tempore, pars aestivalis, Ms. WettFm 2, f. 3r, Cologne, Germany, c. 1330-1335 via e-codices - Virtual Manuscript Library of Switzerland, CC BY-NCInstitutionally Specified Citation Structure:Aarau, Aargauer Kantonsbibliothek, MsWettFm 2, f. 3r – Graduale oesa, Proprium de tempore, pars aestivalis (http://www.e-codices.unifr.ch/en/list/one/kba/WettFm0002) -- source link
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