This guide gives you an overview of recommended sources for philosophy:
The page 'New in the collection' shows recent additions to the philosophy collection of the Erasmus University Library, with an option to subscribe to updates.
From May 11, it's possible to borrow print books from the University Library and the Rotterdamsch Leeskabinet (more information is available here), but it can be hard to visit the campus. Our online collection is still available. Below is a list of ebook packages for the field of philosophy: some are existing licenses, some packages are available because the publisher is now giving everyone access to its ebooks. If you are looking for a specific title, it's better to use sEURch, because there all publishers are covered.
For teachers: if you are looking for online access to a specific book, please let me know, than I can check the available options.