Apple Newton Press (Macintosh) - Manual (Page 51)

Deleting topics from the Table of Contents window
When you delete information from a book, corresponding table of contents
topics are not deleted. You can remove topics from the Table of Contents
window when necessary.
To delete a topic from the table of contents:
1 Click the Overview button on the Newton Press screen to open the Table of Contents
window.
2 Click the topic you want to delete.
3 Press the Delete key, or choose Delete Topic from the Book menu.
If you choose the Undo command from the Edit menu immediately after
deleting the topic, you can restore the topic to the table of contents.
51 Creating a Table of Contents