This package is used to create a ggplot object showing the pre-1890 counties of Scotland. The boundary data is in the scotland_df object, and the scocounties() convenience function plots those data (excluding the Northern Isles by default). Look at the definition of that function to customize what's shown.
To use:
library(devtools)
devtools::install_github('anghyflawn/scotmappR')
library(scotmappR)