Rider faculty may obtain an access card to allow them to use the Firestone Library. The Access Office hours are not the same as the library hours, so you must make sure they are open before going. You will need your Rider ID, and another form of identification. An access card will allow you to browse the collections, and use most databases. Borrowing privileges are not included but may be purchased.
Complete details are available here: Visitor Access
Other Princeton University Libraries do not require an access card.
