U. S. Landforms : What You Need to Know Fact Files Ser. by Linda Crotta Brennan Copyright Year: 2018 ISBN-13: 9781515781257 Available format(s): VOICEText (H) Log in to read What's an Audio Format Audio format refers to the way an audiobook is recorded. Not all audiobooks have the same formats. Classic Audio: A human reading an audiobook without the text displayed. VOICEtext (H): Human narrator with text that you can follow along with as it reads. VOICEtext (S): Synthetic voice with text you can follow along with as it reads.