Encyclopedia of the Supreme Court of the United States
Macmillan / Gale Virtual Reference Library.
Available online. (W&L subscription)
Five-volume set (2008) contains about 1,100 signed articles "on the substance of American law, the processes that produce its legal principles, and the history of the Supreme Court, from its creation to the present," covering "concepts, cases, topics, personalities, institutions, events, and processes."
Links will be maintained in several locations in the library Web site, including here.