Philippi Lansbergii Cyclometriae novae libri dvo .. (1616)
Lansberge, Philippe van, 1561-1632 · Middelbvrgi : Ex officina Richardi Schilders · leaf 16
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Circle · Geometry -- Early works to 1800
Internet Archive · Fisher - University of Toronto · Public domain (published before 1931). Free to use for anything.
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