What do you know about -- inorganic chemistry questions and answers. Test your knowledge series ; Q-73 by National Learning Corporation. Copyright Year: 1991 ISBN-13: 9780837370736 Available format(s): Classic Audio 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.