「ハイキングの科学」Ver4.2
Kindle and Paperback Edition
JP site: https://www.amazon.co.jp/dp/B0DP8CRBF6
"Science of Hiking" Ver4.2
Kindle and Paperback Edition
will appear in a few days.
US site : https://www.amazon.com/dp/B0DQ5J6XK1
Kindle 4.0版以降の所有者は、手元のファイルを削除し、ダウンロードすれば、4.2版になります。上手くいかない場合は2回行う。
If you have this book 4.0 and 4.1 version, delete your file, download again. Then you will get 4.2 version. If it does not work well, do this procedure again. Your book will becomes 4.2 version.