in reply to Hash of Hashes not filling - only using last line of file
Because that's exactly what you're asking it to do; every time through the while(), you're setting %IACISBN_ENUM to a hash with a single key.
You want to add keys to it each time, not re-initialize it. Try something more like:
$IACISBN_ENUM{$IacIsbn} = { [...] };
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