I spent some time yesterday hunting for volume 4 of Archaeologia Aeliana, published in 1846. This may contain an account of the discovery of the Rudchester Mithraeum, and so I wanted to read it.
Sadly Google Books is really bad at handling series. Archive.org generally is better, but I couldn’t find that specific volume. Rather frustrating, that.
On a more positive note, I found that the Journal of Roman Studies is in JSTOR. These days that means that I can access it!
UPDATE: It seems that Rudchester was known as “Rutchester” in the 19th century – all these places along Hadrian’s Wall are little more than farms — and a search for “Rutchester Mithras” in Google Books took me straight to … Archaeologia Aeliana volume 4! I enclose the link for other frustrated searchers. Come on, Google; why not help us here?