TY  - GEN
AU  - POPE JOHN XXIII
TI  - On social progress: Encyclical letter Mater et Magistra
AV  - BX860. J23M37 
PY  - 1961///
CY  - Nairobi
PB  - St. Pauls
KW  - Church and Social Problems
KW  - Catholic Church-Doctrines
ER  -