The archives and library contain a rich variety of material:

•  Comprehensive financial records, which are valuable in shedding light on the functioning of the medieval Hospice, as well as on the life of the seminary from the Counter-Reformation to the present day.

• Architectural records, concerning both the Via di Monserrato site and the various other properties that have belonged to the College over the centuries.

• Guest lists and pilgrim lists, and also the famous Liber Ruber, now in its ninth volume: this College register records the name of every student who has passed through the College since 1579.

• Personal collections, such as the 360 letters written from the College by Fr Gerald Creasey to his parents during the seven years of his formation in the 1950s.

• Papers concerning important individuals who have been associated with the College throughout its history — the Stuarts, Cardinal Nicholas Wiseman, St John Henry Newman, Mgr Christopher Stonor, Mgr George Talbot and Cardinal Rafael Merry del Val, among many others.

• Thousands of photographs dating back well over a century, recording many significant moments and people in the College’s more recent history.

• Correspondence regarding the early history of the dioceses of Baltimore, Philadelphia and Quebec in North America (the so-called North American Agency Papers).