Title: Sanctissimi Domini Nostri Pii divina providentia Papae XI Litterae encyclicae ad venerabiles fratres ... de ordine sociali instaurando et ad evangelicae legis normam perficiendo in annum XL post editas Leonis XIII litteras encyclicas "Rerum Novarum"
Subjects: Commentaries, Papal Encyclicals, Catholic Church. Pope (1878-1903 : Leo XIII), Catholic Church