I think the illustrations inside are derived from Chinese editions, which are available, they only added the English subtitles. I used to bought it at popular and have titles 15 and 17 anyway.

Would you mind scanning them to ebook for sharing, and I 'll scan mine.

Hi, I can sell the books I have to you, since the books are in good condition (with plastic cover although yellowish in sides), I want to know how much you can offer me.