Part

 1 I(1)  |                            Letter to Diognetus, 5,5; Cf. Catechism
 2 I(2)  |    John Paul II, Apostolic Letter Motu Proprio Proclaiming
 3 I(11) |   Cf. Leo XIII, Encyclical Letter Diuturnum illud: ASS 14 (
 4 I(11) |    1882), 4 ff; Encyclical Letter Immortale Dei: ASS 18 (1885–
 5 I(11) |   1886), 162ff; Encyclical Letter Libertas præstantissimum:
 6 I(11) |   1888), 593ff; Encyclical Letter Rerum novarum: ASS 23 (1890–
 7 I(11) |    Benedict XV, Encyclical Letter Pacem Dei munus pulcherrimum:
 8 I(11) | 209ff; Pius XI, Encyclical Letter Quadragesimo anno: AAS 23 (
 9 I(11) |   1931), 190ff; Encyclical Letter Mit brennender Sorge: AAS
10 I(11) | 1937), 145–167; Encyclical Letter Divini Redemptoris: AAS
11 I(11) | 78ff; Pius XII, Encyclical Letter Summi Pontificatus: AAS
12 I(11) |     John XXIII, Encyclical Letter Mater et magistra: AAS 53 (
13 I(11) | 1961), 401–464; Encyclical Letter Pacem in terris: AAS 55 (
14 I(11) |   304; Paul VI, Encyclical Letter Populorum progressio: AAS
15 I(11) |  1967), 257–299; Apostolic Letter Octogesima adveniens: AAS
16 II(12)|   John Paul II, Encyclical Letter Centesimus annus, 46: AAS
17 II(12)|  AAS 83 (1991); Encyclical Letter Veritatis splendor, 101:
18 II(13)|   John Paul II, Encyclical Letter Evangelium vitae, 22: AAS
19 II    |   taught in his Encyclical Letter regarding the situation
20 II(19)|   John Paul II, Encyclical Letter Evangelium vitae, 73.~
21 IV(27)|   John Paul II, Encyclical Letter Fides et ratio, 90: AAS
22 IV(28)|   John Paul II, Encyclical Letter Redemptoris missio, 55:
23 IV(30)|    Cf. Pius IX, Encyclical Letter Quanta cura: ASS 3 (1867),
24 IV(30)|  162; Leo XIII, Encyclical Letter Immortale Dei: ASS 18 (1885),
25 IV(30)|   171; Pius XI, Encyclical Letter Quas primas: AAS 17 (1925),