You will want to follow the link and see vintage national parks posters from the 30's. Love the colors, the composition and the fonts.
There are eight or so posters shown at the National Geographic website, but a Google search yielded the images of many more, and sites where you could buy some. It would be nifty to find some items like these in a local shop or flea market. They would look nice in office here at the house.
Enjoy.
