Apostolic letter (Octogesima adveniens) of his holiness Pope Paul VI to Maurice Cardinal Roy on the occasion of the eightieth anniversary of the encyclical 'Rerum novarum'; [translated from the Latin]
PaulVI,Pope,1897-1978.
Roy, Maurice.
London Catholic Truth Society
1971
Cover title: Social problems
'This translation is based on that issued by the Vatican Polyglot Press' - title page verso
Church and social problems