The Law Reserve Collection on Level 2 has those of Dworkin's titles which are Reading List essentials
Other works will be on open shelf in the Jurisprudence collection on Level 2 - and sometimes as ebooks too!
In the Jurisprudence section on open shelf works by Dworkin are followed by works about his life and his thinking.
Dworkin on record
Commentary on Dworkin and his works