The initial incarnations of Over the Horizon: On the Road in Japan included Glossary material offering more detailed explanations of people, places and events referred to in the text.
Unfortunately, iBooks Author's hyperlink capabilities did not allow links to Glossary entries from the body of text.
The obvious solution was to relocate that material onto website, with hyperlinks from within the iBook or PDF. iBooks Author allows that.
So, for the Japan Travelogues, here it is.
The Islands The Regions The Prefectures
Historical Details
Facilities includes airports and railway stations. Landmarks
Towns, Cities, Urban Entities and Locations
The Railways