Encyclicals and other letters of Pius XII Vol.8 The unity of human society - Summi Pontificatus 1939|The Pope speaks to mothers - Allocution 1941|The mystical body of Christ - Mystici Corporis 1943|Secular Institutes - Provida mater ecclesia 1948|Our Lady of Lourdes - Le Pèlerinage de Lourdes 1957|Chri - Pius XII (New York American Press, 1939)