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Note: click on the number in front of a link to display the full description for the link. You can click on a subject heading to go to the list of full descriptions for that subject.
| 1 | ISBN book directory by LinkBaton search | |
| 2 | ISBN explanation | |
| 3 | Library of Congress Command Keyword Search | |
| 4 | ISBN barcodes | |
| 5 | Calculating the check digit for the ISBN | |
| 6 | ISBN.nu |