Chapter, §

 1   1, 4(1)  |         See Pius IX, encyc.letter Oui pluribus: Pii IX P.M.
 2   1, 4(1)  |     9-10; St. Pius X encyc.letter Singulari quadam: AAS 4 (
 3   1, 4(1)  | 1912), 658; Pius XI, encyc.letter Casti connubii: AAS 22 (
 4   1, 4(1)  | 671-672; John XXIII, encyc.letter Mater et Magistra: AAS 53 (
 5   1, 4(4)  |     ch. 8; Leo XIII, encyc.letter Arcanum: Acta Leonis XIII,
 6   1, 4(4)  |      26-29; Pius XI, encyc.letter Divini illius Magistri:
 7   1, 4(4)  |    22 (1930), 58-61; encyc.letter Casti connubii: AAS 22 (
 8   1, 4(4)  |    395]; John XXIII, encyc.letter Mater et Magistra: AAS 53 (
 9   2, 11(12)|        See Pius XI. encyc. letter Casti connubi: AAS 22 (1930),
10   2, 13(13)|                  See encyc.letter Mater et Magistra: AAS 53 (
11   2, 14(14)|  II, ch. 8; Pius XI, encyc.letter Casti connubii: AAS 22 (
12   2, 14(14)| 857-859; John XXIII, encyc.letter Pacem in terris: AAS 55 (
13   2, 14(15)|         See Pius XI, encyc.letter Casti connubii: AAS 22 (
14   2, 14(16)|  II, ch. 8; Pius XI, encyc.letter Casti connubii: AAS 22 (
15   2, 14(16)|    395]; John XXIII, encyc.letter Mater et Magistra: AAS 53 (
16   2, 18(23)|         See Paul Vl, encyc.letter Populorum progressio: AAS
17   3        |   published Our encyclical letter Populorum Progressio. But
18   3, 23(26)|                      Encyc.letter Mater et Magistra: AAS 53 (
19   3, 23(27)|                  See encyc.letter Populorum progressio, nos.
20   3, 30    | the end of this encyclical letter, We turn Our mind to you,