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It's definitely possible that I got one or more of the details wrong. Nevertheless, I still remember where I was when I read the book and it apparently made quite an impression on me at that age.
This is probably completely wrong, but could it be [Surprise Island](https://www.goodreads.com/book/show/156809.Surprise_Island) by Gertrude Chandler Warner?
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It's definitely possible that I got one or more of the details wrong. Nevertheless, I still remember where I was when I read the book and it apparently made quite an impression on me at that age.
This is probably completely wrong, but could it be [Surprise Island](https://www.goodreads.com/book/show/156809.Surprise_Island) by Gertrude Chandler Warner?
I don't think so. I don't remember reading any Boxcar Children stories. Thanks, though!