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Bailey, Frederick Harold A Course in Mathematics: Algebraic Equations, Functions of One Variable, Analytic Geometry, Differential Calculus

Freeman, Edward Augustus The History of the Norman Conquest of England: The Reign of Harold and the Interregnum. 2D Ed., Re; Volume 1875

Bailey, Frederick Harold A Course in Mathematics: Integral Calculus, Functions of Several Variables, Space Geometry, Differential Equations

Becht, Harold Edward Statistische Gegevens Betreffende Den Handelsomzet Van De Republiek Der Vereenigde Nederlanden Gedurende De 17e Eeuw (1579-1715) ......