Digital archive of U.S. history primary sources. Includes government documents, personal papers and organizational records.
Digital collections of historical material on many topics. Includes manuscripts, printed books and periodicals, and government documents. The material comes from the U.S. National Archives, the U.K. National Archives, and many other libraries and archives.
If you have a citation to a specific book, e.g. San Francisco municipal reports, check the library catalog first, then try Google Books if you don't find it.
Hein Online Library -- see scription of State Statutes: A Historical Archive State Statutes: A Historical Archive
Contains digitized and searchable copies of over 300 years of legal primary sources, such as early U.S. state codes, city charters, constitutional conventions and compilations, and other documents.
Digital library of works from the 19th and early 20th centuries on British Commonwealth and American law. Includes treatises, casebooks, local practice manuals, books on legal form, works for lay readers, pamphlets, letters, and speeches.
Searchable digital archive of trial transcripts, and popular and scholarly accounts of both famous and non-famous historic trials.