TY  - BOOK
AU  - John XXIII
TI  - Mater et Magistra: : Encyclical letter of his holiness Pope John XXIII on Christianity and social progress
PY  - 1961///
CY  - Washington
PB  - National Catholic Welfare Conference
KW  - Church & social problems
KW  - Catholic Church
KW  - Papal documents
KW  - John XXIII
KW  - Encyclical "Mater et Magistra"
ER  -