Great Northern? Japanese 1961 & 2000

Shirokumago to nazono tori (Polar Bear and the Mysterious Birds) Published by Iwanami Shoten, Tokyo.Translated by Teruo Jingu.

Illustrations by Ransome as usual, but someone has skilfully added watercolour to the first of the illustrations in each book.

The later books are still available.

Robert's home page
Ransome home page
Great Northern?
Japanese editions