Category:Pages with ISMN errors

This category is populated by pages and templates that use ISMN.

In this template, ISMN parameters are checked for invalid ISMNs as well as extraneous text such as "ISMN", "N/A", "none", dashes (use hyphens instead), lower-case "x" (use "X" instead), and tab characters.

Error messages for erroneous ISMNs look like one of: Invalid ISMN