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theducks · 03-31-2011, 11:17 AM

Some of my really old Dead Tree ™ books had SAN or ISBN's without the check digit (9 chars long) ( I think there may have been confusion at the time, that the check digit was not part of the ISBN to be printed)

I backed in the check digit by trying [0-9X] until Calibre gave me a Green

ISBN-10 confirmation.
Note: (USA publishers) space or dash were the only separators I saw. never mixed. never interrupted with other characters.

03-31-2011, 11:17 AM	#35
theducks Well trained by Cats Posts: 29,804 Karma: 54830978 Join Date: Aug 2009 Location: The Central Coast of California Device: Kobo Libra2,Kobo Aura2v1, K4NT(Fixed: New Bat.), Galaxy Tab A	Some of my really old Dead Tree ™ books had SAN or ISBN's without the check digit (9 chars long) ( I think there may have been confusion at the time, that the check digit was not part of the ISBN to be printed) I backed in the check digit by trying [0-9X] until Calibre gave me a Green ISBN-10 confirmation. Note: (USA publishers) space or dash were the only separators I saw. never mixed. never interrupted with other characters.