COLLECTED BY
Organization: Internet Archive
The Internet Archive discovers and captures web pages through many different web crawls.
At any given time several distinct crawls are running, some for months, and some every day or longer.
View the web archive through the Wayback Machine.
Collection: Wide Crawl Number 18
TIMESTAMPS
The Wayback Machine - https://web.archive.org/web/20211001160705/https://sebastianraschka.com/pdf/books/dlb/appendix_d_calculus.pdf