Link of the Day: A Collection of Antique American Posters
Most works are dated late 19th or early 20th century.
The Library of Congress digitized and posted on their website a collection of posters from late 19th and early 20th century, among them, for instance, announcements about performances of theater and music groups, or shows of illusionists.
The archive has more than 2,000 posters: for convenience, they are categorized by themes and date.