The choice of scripts, and the extent and nature of book production in Spain, Britain and southern Italy, serve as a reminder of what might have happened without the resources of Carolingian faith and Carolingian power. The evidence for the manuscripts which could be used by Carolingian readers is twofold: manuscripts which have survived in whole or in part, and the few Carolingian catalogues of libraries. Book production throughout the empire on a scale required an increase in the number of scribes, and the formalisation of their training. Carolingian scriptoria developed a uniform script, Caroline minuscule, which could be used to copy texts in Greek, Latin, Old Irish, Old Saxon, and what one regards as the different dialects of German and Romance. Carolingian scribes used enlarged letters to indicate the start of a new section, and punctuation marks to guide the reader in different kinds of graded pause and in recognising questions. The Carolingians secured their classical and patristic heritage.