op did III p.41 Ex A...
http://lila-erc.eu/data/lexicalResources/NLW/id/attestation/26503 <http://www.w3.org/nl/lemon/frac#Attestation>
op did III p.41 Ex A...
op did III p.41 Ex Arithmeticis hic discenda erit Regula Proportionum..., ex Geometria, doctrina Trigonometrica.