Apple Newton Press (Macintosh) - Manual (Page 73)

Removing bookmarks
You can remove bookmarks when you want.
Note: If you are using a version of the Newton operating system earlier than
version 2.0, the Unmark button does not appear on the Bookmark slip and
you cannot eliminate specific bookmarks. When the bookmark slip holds six
bookmarks, adding a new bookmark replaces one of the old ones.
To erase a bookmark:
1 Tap the Bookmark button.
The bookmark slip appears.
2 Tap Unmark.
A list appears.
3 Tap the page you want to unmark or tap All Marks to erase all bookmarks.
The picture of the unmarked page disappears from the slip.
73 Viewing Your Book on a Newton PDA