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Quæstiones geometricæ : in Euclidis & P. Rami stoicheiōsin in usum scholæ mathematicæ collectæ. A doctore Petro Ryff, basil. mathematum professore. Quibus geodæsiam adjecimus per usum radii geometrici. Postremò accessit commentatio optica, sivè brevis tractatio de perspectiva communi, diu optata nec non juventuti satis, perspicua.
Van Pelt - Microtext STC II Reel 1839:7.
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