Category:Pages with ISSN errors

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This category is populated by pages and templates that use {{tl|ISSN}}.

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

Error messages for erroneous ISSNs look like one of: