Slides presented at Engineering Libraries Division Lightning Talk session of the 2019 American Society for Engineering Education (ASEE) Conference in Tampa, FL.

Abstract: UCLA recently cancelled two subscriptions to long-standing and expensive physics journals due to declining usage of the publisher versions of record and open access availability of the same articles through arXiv. The OAISSN.py script, which uses the Crossref Rest and Unpaywall Rest APIs to analyze the number of legal open access versions of articles for a given journal's ISSN and year, was employed to help inform the cancellation decisions.