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theducks · 08-15-2020, 09:50 AM

ISBN are NOT serial numbers. They have no weight (except for the same publisher)

ISBN (10)
Language digit - Publisher 1-7 digits - Book number 7-1 digits -check digit (mod 11)
The (early) BPH's have 1 and 2 digit publisher numbers and lots of book numbers.

When a book changes Publishers, the publisher number changes as well as the book number (that could also just change with edition change)

08-15-2020, 09:50 AM	#5
theducks Well trained by Cats Posts: 31,079 Karma: 60358908 Join Date: Aug 2009 Location: The Central Coast of California Device: Kobo Libra2,Kobo Aura2v1, K4NT(Fixed: New Bat.), Galaxy Tab A	ISBN are NOT serial numbers. They have no weight (except for the same publisher) ISBN (10) Language digit - Publisher 1-7 digits - Book number 7-1 digits -check digit (mod 11) The (early) BPH's have 1 and 2 digit publisher numbers and lots of book numbers. When a book changes Publishers, the publisher number changes as well as the book number (that could also just change with edition change)