¿Es duro? (What Is Hard?) 9781538249819, 2019009114, 9781538249789, 9781538249802, 9781538249796

It's easier to name hard things, like rocks, than understand what this characteristic really means. This book encou

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¿Es duro? (What Is Hard?)
 9781538249819, 2019009114, 9781538249789, 9781538249802, 9781538249796

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