Colours and Shapes :: Environmental Computing
r - Combining legends made by scale_shape_manual with a named vector - Stack Overflow
fillable shapes in legend always black · Issue #2322 · tidyverse/ggplot2 · GitHub
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ggplot2tor
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ggplot2- not rendering the plot correctly - tidyverse - Posit Community
ggplot2: Elegant Graphics for Data Analysis (3e) - 12 Other aesthetics
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Ggplot2: The Manual Scale Shape Assignment of 40 or More Shapes
ggplot2: Legend - Part 3 - Rsquared Academy Blog - Explore Discover Learn
r - Assigning 40 shapes or more in scale_shape_manual - Stack Overflow
Plotting letters as shapes in ggplot2 | R-bloggers
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Chapter 22 Bivariate ggplot2 Scatterplots to Visualize Relationships Between Variables | Reproducible Medical Research with R
r - Colors lost in legend when using scale_shape_manual - Stack Overflow
Ggplot2: The Manual Scale Shape Assignment of 40 or More Shapes
Controlling legend appearance in ggplot2 with override.aes | R-bloggers
