« Tractatus de sphaera caelesti ».
A 1601 treatise on the celestial sphere, held in the Bibliothèque Sainte-Geneviève in Paris and catalogued under astronomy subjects in its reserve manuscripts; the only picture is a circular library ownership stamp reading BIBLIOTHÈQUE SAINTE GENEVIÈVE around a large interlaced S and G monogram, with no astronomical diagram visible. A designer could take from it a compact circular seal layout, with curved lettering set around a central monogram and a typeset ring border.
