The Labadie Collection at the University of Michigan Library in Ann Arbor houses the oldest research collection of 19th and 20th century radical history in the US, and there are now approximately 600 digitized pamphlets available on the library website. The documents from the international social protest movements found in the Collection are from the 19th and 20th centuries, and a few are authored by some familiar names. Visitors should click on "Browse the Collection", near the bottom of the home page, to find such authors as Clarence Darrow, Louisa May Alcott, and the Free Society Group of Chicago. The pamphlets range from the pragmatic "Anarchism: Is it Possible?", to the humorous "Listen to the Mocking Bird: Satiric Songs to Tunes You Know", to the lyrical "In Praise of Freedom: A Selection of Prose and Poetry".