https://lab.operas-eu.org/2023/06/02/the-growing-world-of-open-access-books/
Items tagged with oa.operas in Open Access Tracking Project (OATP) 06/14/2023
https://zenodo.org/record/7928459
Items tagged with oa.operas in Open Access Tracking Project (OATP) 06/27/2023