COLLECTED BY
Collection: MSAG-PDF-CRAWL-2017
Microsoft Academic Graph public corpus (Feb 2016) PDF URLs, filtered to remove large sites (pubmed, citeseerx, arxiv) and already-crawled URLs.
TIMESTAMPS
The Wayback Machine - https://web.archive.org/web/20170809032223/https://dipot.ulb.ac.be/dspace/bitstream/2013/53960/1/wp08031.pdf