There are several library catalogues that may be useful in your research.
SOLO is the library catalogue covering the majority of the Library collections of the University of Oxford including the Bodleian Libraries and most College and other libraries affiliated to the University.
Its search engine, SOLO, allows you to search across a number of different sources, currently Oxford's collections of books and journals (both printed and electronic), ORA (Oxford University Research Archive), the Bodleian Library Allegro Chinese and Allegro Japanese catalogues and title links to the 1,000+ databases also discoverable by A - Z databases
The classification scheme used in the Bodleian Law Library is explained on the classification page.
A - Z databases
A - Z databases links you to the full list of Oxford's online databases. You will find databases covering many different subjects and document types. For example: full text databases including treaties, legislation, case law, official papers, journal articles, commentary and more; indexing services (which will help you find journal articles by subject); and statistics and reference works.
e-journals A- Z is a search & discovery tool just for electronic journals (across all subjects and disciplines) available at Oxford.
If are seeking information about a Law Journal - the name/title of which you know!- then the Law Bod has developed an Oxford specific tool which should help.
Further online catalogues
Library Hub Discover From 31 July 2019 this replaced Copac (a catalogue of the holdings of all universities in the UK) and SUNCat (a catalogue serial holdings held in libraries across the UK).
Allegro is a catalogue of the Oxford University Library holdings in CJK script.
FLAG is an index of foreign law collections throughout the UK.
WorldCat searches for items in libraries worldwide.
English Short Title Catalogue is provided by the British Library and covers monograph and serial letterpress items printed before 1801.