The great majority are the journals published at various American law schools. Although they are typically edited by students, many of them are the leading journals in American law, containing articles by professors, judges, practitioners, and other recognized authorities. Most of them deal with all areas of law, though some concentrate on particular subjects.
There are also journals published by professional bodies (e.g. the American Bar Association), by other specialized bodies (e.g. the Copyright Society of the U.S.A.), and by commercial publishers.
Pre 2000 issues of journals are shelved on Floor 0, ground floor.
Holders of an Oxford SSO have 3 main online routes to articles published in US law journals. See below.
The third link may be a quick way to find US OA journal articles
Access to WPs and preprints
Holders of an Oxford SSO can access CILP, the Current Index to Legal Periodicals produced by the Gallagher Law Library (Washington University) via both HeinOnline & Westlaw.
As HeinOnline's (USA) Law Journal Library is so extensive, it using Scholarcheck is a useful tool within Hein.
An Index to Legal Periodical Literature (1803-1937)
|Ref Bibl General I35|
ILP : Index to Legal Periodicals (1908-1996)
|Ref Bibl General I56