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/20170816010732/https://www.openstarts.units.it/dspace/bitstream/10077/3767/1/Guarino%20et%20al%2c%20bioidentify.pdf