Every element of the list is a data frame, which can be used with 'ggplot2'.
A list with 8 data frames with swiss territory boundaries (at various levels).
Columns are not all the same across data frames, but usually they have the following in common:
long. Longitude coordinate (x)
lat. Latitude coordinate (y)
group. A factor to be used to plot the polygons correctly (with ggplot2)
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