The Teaching with the Library of Congress blog gives some great tips on using the WPA Poster collection with students. One idea is to have students identify persuasion techniques. For a great resource on typical advertising persuasion techniques, check out Print Advertising Across the Centuries project. One teacher used this project as a template and created a lesson that looked at U.S. military recruitment posters. Intrigued? Be sure to check out all of the Library’s poster and graphic arts collections.