Experienced with both hornbooks and battledores, children graduated on to the modern concept of a small book, multiple paper pages covered with a thick, protective layer. Early reading booklets or religious primers contained both the alphabet and increasingly complicated lists of alphabetized syllables along with selected excerpts from the Bible. From tablet to booklet, the ABC format served as the most common framework for additional reading materials. The first church primers paralleled the introduction of school textbooks known as "the ABC". Both colonial primers and ABC spellers employed the alphabet as an organizational feature for literacy instruction and spiritual study.