WDB	Perspectiva Horaria Sive De Horographia Gnomonica Tvm Theoretica, Tvm Practica Libri Qvatvor : In quibus Gnomonices antiqui fines latiùs protenduntur: traditurque ratio, & delineatio Geometrica expeditissima non solùm communium, quæ radio directo.../ Maignan, Emmanuel. - Electronic ed.. - Romae : Rubeus, 1648 Permalink: http://diglib.hab.de/drucke/17-geom-2f/start.htm					Deutsch
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