gorbutovich:
University of Pennsylvania LJS 27: Algorismus, fol. 81r [=79r
gorbutovich:
University of Pennsylvania LJS 27: Algorismus, fol. 79v [=78v
gorbutovich:
University of Pennsylvania LJS 27: Algorismus, fol. 99r [=97r
gorbutovich:
University of Pennsylvania LJS 27: Algorismus, fol. 99r [=97r
gorbutovich:
University of Pennsylvania LJS 27: Algorismus, fol. 99r [=97r