The Sankey Diagram shows the circulation of all books from the beginning of their circulation through the centuries (from 1459 to 2017) in different cities. Users can click on the links to find out the corresponding book IDs.

Users can view the Sankey diagram for a particular book by searching or selecting a specific book ID. The map shows the detailed circulation path of the selected book from the beginning of its circulation to different centuries and cities.

The two simplified Sankey diagrams below focus on showing the circulation of each book from the beginning to the end of the book, without going into the details of the circulation process in between. This provides users with a clear, intuitive view to understand the overall circulation path of a book. Users can click on the links to find out the corresponding book IDs.