The backsides of more than 450 double-sided US posters are available online for the first time at digitalcollections.hoover.org. In some cases the back contains information about the publisher. In other cases, the reverse contains unique images and text that complements the front. Double-sided posters may have been designed for mounting in the window of a building or store front, where both sides could be viewed. In other cases, the intent may have been to allow the recipient of the poster to interact with it, reading front and back and then choosing which side to display on a wall. Many of the posters are from a series of World War II newsmaps, which feature photographs, maps, illustrations identifying planes and ships, summaries of recent military action, and a variety of war-related messages.