Defining isometric lines as those portraying basic numerical distributions, and isopleths as portraying values, this paper traces the growth of the 'iso' family from the use of the isobath in 1584, through other members of the isometric family to the conception of the isopleth in 1845, its birth in 1857, and its christening in 1859.
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Arthur H. Robinson (1971) studied this question.
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