Does this mean that there are 600 million unique books in the world? Hardly. There is still a lot of duplication within a single provider (e.g. libraries holding multiple distinct copies of a book) and among providers -- for example, we have 96 records from 46 providers for “Programming Perl, 3rd Edition”. Twice every week we group all those records into “tome” clusters, taking into account nearly all attributes of each record.
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