William Van Ornum's survey  of the Vatican tradition of coin and medal making appears in the March 28 issue. Here he offers additional resources for coin enthusiasts. To browse additional coins and medal produced by the Vatican, view our slideshow .Books
Papal Coins , Allen G. Berman (South Salem, NY: Attic Books, 1991). The standard reference book on papal coins.
La Sede Vacante Pontificia e le sue Medaglie, G. Boccia (Roma: Edizioni Fragi, 2003). A beautiful book on sede vacante medals, those issued during a time of papal interregnum.
Rome Resurgens: Papal Medals from the Age of the Baroque , Nathan T. Whitman (Ann Arbor: University of Michigan Museum of Art, 1981). Selected papal medals from 1534 to 1747.
Pictorial Catalogue of Papal Medals 1417-1942 . As struck by The Mint of Rome for the Vatican.
A selection of photos and information  from Peter Jencius.
Photo: courtesy Q. David Bowers, Stacks Bower's Galleries, New York City.