Posters: This is immersion. These poster images are in the public domain. If your students are like me, they are very visual. This is a quote wall (like a vocabulary word wall) . The 8 1/2 by 11 are "easy" to print on your home computer.
If you choose the 13 by 19, you will have to go to Staples or Office Max to print, unless you have a printer that large.