TY  - GEN
AU  - Pope Paul VI البابا بولس السادس
TI  - Encyclical Letter Populorum progressio and  Apostolic letter Octogesima adveniens on the occasion of the eightieth anniversary of the encyclical Rerum novarum
PY  - 1971///
CY  - Vatican
PB  - Typis Polyglottis Vaticanis
KW  - English
N1  - Washington, D.C. : United States Catholic Conference, 1971
ER  -