COLLECTED BY
Collection: Arquivo.pt: the Portuguese web-archive
Arquivo.pt - The Portuguese web-archive (PWA) is the national Web archive of Portugal. Its mission is to periodically archive contents of national interest available on the Web, storing and preserving for future generations information of historical relevance. It is a service of the Foundation for Science and Technology (FCT).
TIMESTAMPS
The Wayback Machine - https://web.archive.org/web/20211018093839/http://cran.r-project.org/doc/manuals/R-intro.pdf