I'd also recommend students looking at:
GoogleBooks
Hathi Trust
Project Gutenberg
Internet ARchive
British LIbrary
All of these (and many many more sites) have digitised, scanned, or photographed rare books materials.
Since March, I've also taught several modules in historical studies, introducing students to databases subscribed to by my institution (an RG at the opposite end of the country than Exeter) at huge expense (this is where a lot of the tuition fees go - to online publishers at 10s of thousands of pounds per year per database).
These are all there for students to use, but many of them hadn't explored the possibilities - they'd just thrown up their hands.
We all have to work this way now.
Over this last 10 months, without regular access to libraries essential to my work (I've had 2 x 4 hour stints in the British Library, travelling 3 hours each way each time) I've written a grant application worth 2 million, and most of a book. Both rely on on archival material, which I usually consult in hard copy. I've had to find my way through multiple archival databases and sources. It's doable, and there is assistance for students.
For example, subject librarians are there to assist students in navigating all of this. But a student needs to ask first.