Category:Pages with ISMN errors

Help desk

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