The Heidelberg Catechism is the most widely used of the Catechisms of the Reformed churches. Some Methodist denominations also publish catechisms, which concisely summarise Christian doctrine. The Danish translation of the Bible was used as were Danish catechisms and hymns. Three Reformed catechisms in the Prussian language were published between 1545 and 1561. The Anabaptists have also produced catechisms of their own, to explain and defend their distinctives. Parliament demanded scripture proofs for the catechisms as well. A type of colonial-era pictorial religious texts are catechisms called Testerian manuscripts. There were certain differences between catechisms for the young baptized and for the unbaptized catechumen. Catholic Catechisms, published by individuals existed as well. Memorization, catechisms, and scripture formed the basis of what education was available. The Scots General Assembly approved both catechisms in 1648. The Congregation also operated a polyglot printing press in Rome, printing catechisms in many languages. The concordats and agreements also regulate public school catechisms and military chaplains. These lessons were taught in a form that resembled catechisms. Eliot would later teach Indians to read and write using hand-written catechisms that were copied.