Subject is exactly Mater et magistra
Letter to Pope John XXIIIA letter from leaders of the JOC Internationale to Pope John XXIII the day before the opening of Vatican II.
During the reign of John XXIII: A New PentecostCardijn recalls his meetings with and pays tribute to Pope John XXIII following his death.
Eucharist and the New ManCardijn's speech on the meaning of the Eucharist delivered at the International Eucharistic Congress in Bombay (Mumbai) in 1964.
The Church and the world of labourNotes prepared by Cardijn for Pope John XXIII to assist in the drafting of an encyclical for the 70th anniversary of Rerum Novarum, which became Mater et Magistra.