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I read the eBook of this one, and it was from the original publication version, but the paper edition from the library was a later revision published in 1958. I discovered this when my daughter had tried the Audible version and found it was different than the eBook she had downloaded, so I went looking around. The general story was the same, as far as I can tell, but some of the details were changed - on the very first page, where the 1928 had a "colored laboratory helper" who says "Doctah" the
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