While the Law Library has a number of Research Guides on various jurisdiction, there is not a guide on every jurisdiction. If the Law Library does not have a research guide on your particular jurisdiction, try the following resources:
Globalex
New York University School of Law's Globalex contains a foreign law research collection with chapters on over 150 countries. The guides are written by expert law librarians from each jurisdiction and include information about the legal system and links to free sources of law (if available).
If there are multiple revisions for a guide on a jurisdiction, be sure to click the UPDATE link next to the original guide for that jurisdiction.
Note: the hyperlink to the guide will take you to the first version published. If you see an Update next to the guide - this is the most recent version available.
Library of Congress
The United States Library of Congress Law Library has produced guides to online legal research for a variety of nations. These highlight the primary sources for a range of jurisdictions, and where to find them online (if possible). The Library of Congress also has Foreign Law Research Guides for a selection of countries.
Other University Research Guides
Several other universities also produce good foreign and comparative law research guides such as Georgetown Law Library’s Foreign and Comparative Law Research Guide and Harvard Law School Library's Free Legal Research Resources on Foreign and International Law.