ISBN 0870213991 hat failed the check­sum digit test.
The following 18 formally correct ISBNs were determined. Starting from these ISBNs the value 0870213991 that you input could have resulted frome one error (error in one digit or transposition of two digits.) You can now check using the links given for the catalogs of amazon.co.uk, amazon.com and amazon.de whether any book is listed for the respective URL. To the home page
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ISBN prefix group: English language
ISBNas­su­med er­rorCatalogs for checking
0-07-821399-12nd and 4th digits were swap­ped. amazon.co.uk amazon.com amazon.de
0-570-21399-1second digit was chan­ged. amazon.co.uk amazon.com amazon.de
0-8302-1799-13rd and 7th digits were swap­ped. amazon.co.uk amazon.com amazon.de
0-85021-399-1third digit was chan­ged. amazon.co.uk amazon.com amazon.de
0-87011-399-25th and 10th digits were swap­ped. amazon.co.uk amazon.com amazon.de
0-87020-399-1sixth digit was chan­ged. amazon.co.uk amazon.com amazon.de
0-87021-309-1eighth digit was chan­ged. amazon.co.uk amazon.com amazon.de
0-87021-319-98th and 10th digits were swap­ped. amazon.co.uk amazon.com amazon.de
0-87021-391-1ninth digit was chan­ged. amazon.co.uk amazon.com amazon.de
0-87021-399-7tenth digit was chan­ged. amazon.co.uk amazon.com amazon.de
0-87021-939-17th and 8th digits were swap­ped. amazon.co.uk amazon.com amazon.de
0-87031-399-1fifth digit was chan­ged. amazon.co.uk amazon.com amazon.de
0-87091-392-15th and 9th digits were swap­ped. amazon.co.uk amazon.com amazon.de
0-87121-399-04th and 10th digits were swap­ped. amazon.co.uk amazon.com amazon.de
0-87421-399-1fourth digit was chan­ged. amazon.co.uk amazon.com amazon.de
0-9702138-9-12nd and 8th digits were swap­ped. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: former U.S.S.R
ISBNas­su­med er­rorCatalogs for checking
5-87021-399-1first digit was chan­ged. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: Argentina
ISBNas­su­med er­rorCatalogs for checking
987-02-1390-11st and 9th digits were swap­ped. amazon.co.uk amazon.com amazon.de

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