The whetstone of witte, whiche is the seconde parte of arithmetike: containyng thextraction of rootes: the cossike practise, with the rule of Equation: and the woorkes of surde nombers / [Robert Record].

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The whetstone of witte, whiche is the seconde parte of arithmetike: containyng thextraction of rootes: the cossike practise, with the rule of Equation: and the woorkes of surde nombers / [Robert Record]. Public Domain Mark. Source: Wellcome Collection.