English: Practice of land surveying. Title page of Practijck des Lantmetens by Johan Sems & Jan Pietersz Dou. Printed by Jan Bouwensz in Leiden, 1600. Four aspects of mathematics: the circle as pure mathematics, the land surveyor, building of a fortress & navigation. Copy from the Royal Library The Hague, shelf no. 145 D 19: 1
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