Abstract
The first choropleth map was created in 1826 by Baron Charles Dupin. It was a gray-shaded map concerning primary school education across France. Choropleth maps are also called thematic maps.
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Bessler, L. (2023). Delivering Precise Numbers When Using PROC SGMAP. In: Visual Data Insights Using SAS ODS Graphics. Apress, Berkeley, CA. https://doi.org/10.1007/978-1-4842-8609-8_15
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DOI: https://doi.org/10.1007/978-1-4842-8609-8_15
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