Almost all U.S. law journals are available via Westlaw and Lexis. For older articles or articles in PDF format, check HeinOnline. Article indexes can be useful tools for locating articles on specific topics.
The Library provides access to over 220,000 ejournals and newspaper titles. For journal articles from disciplines other than law, start with Articles Plus, which contains articles drawn from hundreds of databases and over 40,000 journals.
For research in a particular subject, you should use Database Finder to locate Library databases specializing in that subject. You can search by database title or browse by subject.
There are also research guides with helpful starting points for research in various areas.