A SOLO Search also shows you if we have a subscription to an e-book version of a text ... but we have far more on the shelf than we do online.
The collection of books with shelfmarks starting Roman are on Floor 2.
Subject searches to try in SOLO
Obligations (Roman law)
Contracts (Roman law)
Torts (Roman law)
Unjust enrichment (Roman law)
A reading knowledge of German and Italian in particular is very useful for advanced research.