WDB	Opus sphericum Johannis de sacro busto figuris et p[er]utili co[m]mento illustratu[m] / de Sacrobosco, Johannes *1195-1256*. - Electronic ed.. - Agrippine : Quentell, 7.VII.1500 Permalink: http://diglib.hab.de/inkunabeln/51-6-astron/start.htm					Deutsch
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