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  2. Choropleth map - Wikipedia

    en.wikipedia.org/wiki/Choropleth_map

    Dupin's 1826 map of literacy in France. The earliest known choropleth map was created in 1826 by Baron Pierre Charles Dupin, depicting the availability of basic education in France by department. [4]

  3. HuffPost

    big.assets.huffingtonpost.com/athena/files/2024/...

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