Encyclical letter of His Holiness Paul VI
Subtitle: Pope, to the bishops, priests, religious, the faithful, and to all men of good will on the  development of peoples
Publisher: Vatican Polyglot Press; Dist. by United States Catholic Conference
Published: 1967
Place of publication: Vatican City
Language: eng
Number of pages: 61
Subjects: Economic development; Church and social problems; Catholic Church; Papal documents
Notes: Bibliographical footnotes.