Catechism of Saint Pius X

The Catechism of Saint Pius X is a name commonly used for a 1910 English translation of the catechismo maggiore, a portion of the Compendio della dottrina cristiana which Pope Pius X prescribed to be used for catechesis in the Diocese and Province of Rome in 1905. In 1912, Pius prescribed a new catechism for the same use, the Catechismo della dottrina cristiana, which he described as much shorter and better adapted to present-day needs.

Source: Wikipedia — Catechism of Saint Pius X (CC BY-SA 4.0)