Use Maps
http://www.gooddocuments.com/techniques/maps.htm

Bricklin, Dan
Good Documents
1998

Abstract:

Two-dimensional images that represent the organization of the pages in a document can help the reader understand that organization. They can use that understanding when trying to navigate to parts of the document that interest them. By using clickable image maps, such that when readers click on the representation of a particular page in the document they are immediately taken there, allow them to navigate directly. This gives them a better feeling for the document, more like a physical item like a book with pages than an endless scroll of paper.