Cases are tried in local, state, federal and special courts. Their decisions are collected in sets usually called Reporters. The library collects cases from the United States Supreme Court, the Illinois Supreme Court, and the Illinois Apellate Court.
U.S. Supreme Court Decisons are available in United States Supreme Court Reports: Lawyers Edition
Illinois Supreme and Appelate Court cases are collected in Illinois Decisions
These same decisions can appear in other reporters as well for example Illinois Supreme Court Cases appear in the NorthEastern Reporter The library has the the Northeatern Reporter through the year 1965.
Most state and federal courts post their opinions online now. Findlaw.com is one place that collects decisions and is freely available. The library subscribes to a legal datbases called Campus Research. All federal and state decisions are availbale through Campus Research Harper tudents and employees may search this database on or off campus. Non-Students may search Campus Research, but must come on campus to use it.