Legal writing makes much use of abbreviations, acronyms, and initialisms. These abbreviations refer to journals, law reports, and more.
The Alma Jordan Library's (AJL) collection includes a few dictionaries of legal abbreviations. Legal reference works (e.g., other dictionaries) and books may also contain relevant lists/tables of abbreviations, and so too may the various legal citing and referencing style manuals. Check the preliminary (front) pages, table of contents, appendices of those publications.
There are also websites that offer guidance on legal abbreviations.