"yarn" in R

Whilst trying to follow the PCA tutorial from the following page http://nir-quimiometria.blogspot.de/2012/02/pca-for-nir-spectrapart-001-plotting.html I couldn't find the "yarn" dataset, and couldn't find any information about where it was from, whether it was bundled with the R source etc. Trying to evaluate yarn simply gave the following:

Error: object 'yarn' not found

After some searching I stumbled across the documentation for the pls library. It turns out the data is bundled with the pls library. Running the following allowed me to use the dataset:

install.packages("pls")

library("pls")

Now on with the rest of the tutorial!