polygon - Keep customized colors with geom_polygon() - Geographic

Chapter 14 Graphing Part II STA 444/5 - Introductory Data Science using R

Custom color in a map(polygons) by ggplot in R and plot a legend - Stack Overflow

r - color polygon boundaries by factor - Stack Overflow

Chapter 7 Map R Gallery Book

shapefile - Using R to calculate the area of multiple polygons on a map that intersect with another overlaid polygon - Geographic Information Systems Stack Exchange

r - Remove border lines in ggplot map/choropleth - Stack Overflow

Is there a way to zoom in on a mapped polygon (SpatialPolygonsDataFrame) in R (ggplot) without it disappearing? - Geographic Information Systems Stack Exchange

shapefile - What is the cause of 'tearing' of polygons (artifacts) using R, ggplot and geom_polygon? - Geographic Information Systems Stack Exchange

r - Why does geom_sf is not allowing fill with discrete column from a dataframe? - Stack Overflow