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Answer on why LC response appears to differ from Classify
After going through some code, looks like LC "fails" to return a DDC when there are multiple works with the same ISBN. The Classify demo site, otoh, returns all of the multiple works. You then have to click on the one you want to see the DDC for that work.
A similar thing could be done in LC by always taking the most popular work, and then re-running the classifier on its OWI, and outputting the DDC for that work. That would not be 100% accurate, which is probably why it simply returns nothing. For my purposes though, it would be preferable.
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