Optional Readonlyfallbackonly worth a try once no source has the package for sure: a mirror of every package that ever was on CRAN
also holds the ancient copy of one that moved to Bioconductor (limma)
Readonlyoriginwhat the recovered package says it came from, like cran or github:masurp/ggmirt
Optional Readonlysubdirthe directory of the package within the archive, for a repository holding more than the package
Readonlyurla .tar.gz (or plain .tar) of the package source
One archive that may hold the package source.