Teachers may want to get more in-depth content on the Vatican stamps in order to expand or extend lessons.
• Read the introduction of the Vatican Stamps landing page and the narrative overviews of stamps during each pontificate. Check out the Vatican Stamps. They are all located at http://postalmuseum.si.edu/VaticanStamps.
• The Vatican Philately organization has a website with additional historical content on Vatican stamps. In addition they provide links to their postal issues, exhibit halls, maps of the Vatican City throughout the century, and articles. Check their website at http://vaticanphilately.org.