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Gulielmus Hall
Keckerman, Bartholomaeus. Systema Compendiosum Totius Mathematices, hoc est Geometriae, Opticae, Astronomiae, Et Geographiae. .Item Methodus facilis Arithmaticae Practicae Per Gemmam Frisium. Oxford: Gulielmus Hall, 1661. (Pts. 2-5)
Keckerman, Bartholomaeus. Systema Compendiosum Totius Mathematices, hoc est Geometriae, Opticae, Astronomiae, Et Geographiae. .Item Methodus facilis Arithmaticae Practicae Per Gemmam Frisium. Oxford: Gulielmus Hall, 1661. (Pts. 1 and 6)