Setup
install.packages(c('dplyr', 'ggplot2', 'readr'))
download.file("https://datacarpentry.org/semester-biology/data/dinosaur_lengths.csv",
"surveys.csv")
download.file("https://datacarpentry.org/semester-biology/data/ramesh2010-macroplots.csv",
"ramesh2010-macroplots.csv")
download.file("https://ndownloader.figshare.com/files/5629536",
"TREE_SURVEYS.txt")