I love this old poster I found on Flickr's Creative Commons pool, courtesy of the Boston Public Library. According to the notes on the image: The American Library
Association produced this poster as a part of its "Books for Sammies"
campaign to send books to soldiers. In WW I, the English called American
soldiers "Yanks" or "Sammies" for Uncle Sam. Thousands of these posters
were displayed in libraries and expanded the libraries' visibility and
their role as community centers by participating in wartime... [More]