I visited the American Numismatic Society Library at 75 Varick St., just off Canal St., in Lower Manhattan.
They have different volumes of the series by Cusumano and Modesti. Particular attention was given to Pio XII, Nellas Medagli, 1939-1958. This was published in 1989 and includes posthumous medals. An interesting Appendix lists medals by artist.
I explored the Giovanni XXIII Nella Medaglia 1958-1963, by Modesti, published in 2010. One interesting feature of all these medals is the variety of hats worn by the Pope. Many show him in the Papal Tiara--he was the last Pope to wear this. He is also shown wearing what I would call a walking hat with wide brim, and also a soft cloth-leather cap. I'm sure there is a name for this!
This volume shows 623 different medals on Good Pope John, from the Vatican as well as other sources.
I am planning more visits to ANA in the future.